(L-R) Australia's Brittany Elmslie, Emma Mckeon, Bronte Campbell and Cate Campbell celebrate after breaking the world record to win the Women's 4x100m Freestyle Relay Final at the Rio 2016 Olympic Games on August 6, 2016 (AFP Photo/Gabriel Bouys) 
 
 Rio de Janeiro (AFP) - Record-breaking Australia -- inspired by Mack Horton and Cate Campbell -- put their stamp on the Rio Olympics and moved top of the medals table after an intense first day of action. 
 
 Bomb and bullet scares and a horrific double leg break were among the shocks on Saturday, while fans fumed over long queues for venues at Rio's Olympic Park. 
 
 But a trio of swimming world records and a first ever Olympic gold for Vietnam kept the focus on the sporting action as 12 titles were handed out. 
 
 There was joy for teenage American shooter Ginny Thrasher, who upset China's champions to snare the first gold of the Games in the women's 10m air pistol. 
 
 Belgium's Greg Van Avermaet won a crash-filled men's cycling road race, and rugby returned to the Games after a gap of 92 years. 
 
 Britain's Adam Peaty was the early star in the swimming pool. He set an eye-popping new world record of 57.55sec in the men's 100m breaststroke heats -- his first ever Olympic swim. 
 
 Later Hungary's Katinka Hosszu shattered the world record by more than two seconds to win the women's 4x100m individual medley. 
 
 But Australia dominated the first night in the pool, first when Horton dethroned China's Sun Yang to win the men's 400m freestyle. 
 
 Individual world record-holder Campbell then anchored Australia to 4x100m freestyle gold in 3min 30.65sec, the fastest time in history. 
 
 "Definitely my favorite race ever, in an Olympic final with my sister and two girls I have known since I was 12, 13 years old and a gold and a world record," said Campbell, who swam with Emma McKeon, Brittany Elmslie and her sister Bronte. 
 
 "You can't ask for more," said Bronte Campbell. "Every kid dreams of it, it's what we always hoped for." 
 
 The results pushed Australia to the top of the early medals table and confirmed their return to prominence in swimming, after their poor outing at London 2012. 
 
 The Rio Games started with an unwanted bang when a military bomb squad detonated a suspicious package near the finish of the men's cycle race at Copacabana beach, causing jitters among onlookers. 
 
 - Stray bullet - 
 
 At the equestrian venue at Deodoro, which is on a military base, a stray bullet ripped through the media centre's canvas roof and landed on the floor. 
 
 "All authorities assured that the bullet was a stray bullet that has nothing to do with the Games or the Olympic family or the press. The area was not a target," said Games spokesman Mario Andrada. 
 
 Later Hoang Xuan Vinh wrote his name in the history books when he won the men's 10m air pistol, claiming the first ever gold medal for communist Vietnam. 
 
 "It's the first gold medal in Vietnam's history, I feel very lucky," said the modest, 41-year-old military officer. 
 
 Thailand's Sopita Tanasan won the first weightlifting gold, the women's -48kg, with a total lift of 200kg. 
 
 Scandal-hit Russia, under fire over a massive doping scandal, got off the mark when Beslan Mudranov won the men's 60kg judo. 
 
 Van Avermaet avoided a crash on the final descent and overhauled leader Rafal Majka with a lung-busting sprint to win the 237.5km (147.5 miles) cycle race. 
 
 "It was the hardest day I've ever had in my life on a bike," said Ireland's Dan Martin, who finished 13th, one place behind Tour de France winner Chris Froome. 
 
 Serbian rowers Milos Vasic and Nenad Bedik capsized in choppy waters at the Rodrigo de Freitas lagoon, but won a reprieve when they were allowed to move into the next round. 
 
 French gymnast Samir Ait Said suffered Olympic agony. His lower left leg snapped and skewed to a gruesome angle when he landed awkwardly from a vault. 
 
 Yusra Mardini, the Syrian refugee who was swimming for her life to a Greek island less than a year ago, won her 100m butterfly heat but failed to reach the semi-finals. 
 
 "Everything was amazing. It was the only thing I ever wanted was to compete in the Olympics," said the 18-year-old, who is representing the Games' first ever refugee team. ||||| Officials stand near the body of a man that was shot and killed near Maracana Stadium. (Photo: Mark Humphrey, AP) 
 
 RIO DE JANEIRO — Rio police say a man was shot dead near Maracana Stadium after Friday's Olympic opening ceremony. 
 
 According to Rio's Civil Police Department, a 22-year-old Brazilian named Ronaldo Marques de Souza was assaulting people in the crowd as the 53,000 attendees were being let out of the stadium. An officer from an unidentified agency who was assisting with Olympic security responded and shot the man, according to a statement. 
 
 Brazilian officials have pulled in police from around the country to conduct security around the Games, a total of 85,000 law enforcement officials. The statement from Rio police said the officer came from another state in Brazil, but did not specify which one. 
 
 Associated Press photographers gave a different account of the shooting. They reported hearing multiple, loud gun shots, forcing Games volunteers and others leaving the ceremony to duck for cover behind cars. The photographers said they then saw a shooter running from the scene and fleeing in a car close to a university parking lot. 
 
 After police and medics arrived on the scene, paramedics were seen treating the victim as blood poured from his body onto the road. 
 
 Rio police says it is continuing its investigation. 
 
 This is the second shooting death in the Olympic city this week, and that one has varying descriptions as well. Brazil police originally said a Russian diplomat fought off a would-be robber, whose gun went off. The alleged assailant was killed. The Russian embassy, though, said no Russian official was involved. ||||| Rio De Janeiro: A stray bullet, believed to have been fired from a Brazilian military rifle, has narrowly missed photographers during the first day of Olympic competition at the Equestrian Centre in Rio De Janeiro. 
 
 Olympic organisers and the military are trying to work out where the bullet, which pierced the plastic roof of the media centre canvas and landed within metres of photographers, came from. 
 
 British freelance photographer Jon Stroud, who was sitting closest to where the bullet landed, expanded on the frightening ordeal which shocked the entire media centre located next to the Brazilian military base in Deodoro. 
 
 "It was general disbelief," Stroud said. 
 
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 Link The bullet which landed inside the media centre at the Olympic Equestrian Centre. Photo: Rob Carr 
 
 "You have to take a while to process that feeling. It's fortunate it's come through in a corner in a clear area. But a few feet in any direction you start getting into tables and computers and journalists and photographers." 
 
 There were close to 100 working media in the press centre at the time. 
 
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 The Equestrian Centre is heavily guarded by police and armed military, most standing with rifle in hand as they protect the streets of Rio. 
 
 "We were in here in the lunch break, which is the busiest time in the press room ​and just heard a really loud bang right behind us," Stroud said. 
 
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 Link The bullet pierced the roof of the media centre at Rio's equestrian centre. Photo: Getty Images 
 
 "We just thought it was something falling off the ceiling, a light or something like that. We went over and took a look, lying on the ground over there was a bullet. A stray round. We were pretty shocked at the time. 
 
 "A member of the photo team here took the bullet away. There was a lot of discussion on radios and a little while later we saw them just outside the door there with military, passing the bullet back and forth and trying to establish where it might have come from." 
 
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 Link A member of the Brazilian National Force holds a bullet inside the equestrian media centre. Photo: Getty Images 
 
 Despite being so close to the military base, Stroud said he was flabbergasted anyone was allowed to fire a shot with thousands of people flocking to many of the Olympic venues through the rough streets of Deodoro. 
 
 "If anything I feel a bit amazed that during an Olympic competition, albeit the fact we're on a military site, that there could be any kind of sanctioned live fire within range of any kind of where we all are," Stroud said. 
 
 "I can't begin to imagine who thought that was a good thing." 
 
 Commotion as bullet pierces the #Rio2016 #Olympics equestrian press office and clatters to floor of the packed room https://t.co/ti2zhYQ0oa — Alice Collins (@msAliceCollins) August 6, 2016 
 
 An investigation between police, military and Olympic organisers is taking place to determine where the bullet came from. 
 
 But a Rio Olympics spokesperson insists "100 per cent it has nothing to do with the Games." 
 
 "Authorities are investigating but the bullet, the distance, where it comes from, why it comes here, the first information that we have got is that they can already determine that this area was not a target," he said. 
 
 "It was a stray bullet. They can also confirm it has nothing to do with the Games, but they cannot be more precise at the moment. All investigations are being carried out with army, technical experts, local police. 
 
 "We don't have any information if they were doing firing exercises so we don't have any information if they are going to continue to do them. 
 
 "They have assured us they have re-enforced security around this area." 
 
 ||||| A stray bullet fired into a media tent at the equestrian venue and a controlled explosion near the finish line of the road cycling threatened to overshadow the opening day of action at the 2016 Olympics. 
 
 Rio Olympics 2016: men's road race heads for conclusion on day one – live! Read more 
 
 Even as organisers scrambled to investigate both issues, they were also having to promise to redouble efforts to shift unsold tickets and improve long queueing times amid angry complaints from those who had not been able to enter venues in time to watch the action. 
 
 While there was an upbeat mood in the city and organisers were pleased with the reaction to Friday’s opening ceremony, empty seats in many venues and long queues to get into others soon caused frustration and delays. 
 
 The most dramatic incident of the day came as eyewitnesses reported a bullet from a 5.56mm assault rifle pierced the roof of the media tent and fell to the floor near a Team GB press officer and a British photographer working for the British Equestrian Foundation. 
 
 The venue is next door to a media base and there was speculation that it may have accidentally been fired from there. A Rio 2016 spokesman said: “We are aware of the incident and monitoring the investigation by the security forces. No one was hurt.” 
 
 At Copacabana, as crowds gathered to watch the denouement to the men’s cycling road race, there was a brief commotion when bomb control officers arrived suddenly to detonate a suspect package about 150 yards from the finish line. “The security services found a suspicious package … and as a precaution decided to perform a controlled explosion,” said a Rio 2016 spokesman. 
 
 Officials said there was no impact on the race, which was at that point only halfway through. The suspect package was believed to be a small bag. 
 
 On the morning after the opening ceremony the night before, largely well received by the Brazilian media and public, organisers hoped to maintain the momentum. But huge swaths of empty seats visible in the gymnastics, boxing, handball, rugby sevens and hockey arenas as the action got under way detracted from the picture postcard backdrops on show elsewhere. 
 
 On Copacabana, fans faced huge queues to enter the beach volleyball arena while others waited in line to buy tickets. Meanwhile the action started in front of largely empty stands, although they were much fuller later with Brazilian athletes in action. 
 
 While some queues were good-natured, at others fans became angry at having to endure lengthy security queues. “I don’t believe it. It’s absurd, ridiculous,” said Natalia Carvalho, 28, a Rio resident who had wanted to see Brazilian gymnast and medal hopeful Arthur Zanetti compete. 
 
 Games organisers blamed the situation on a lack of coordination between various groups of security personnel, including the police, Games staff and private security firms. The Rio 2016 director of communications blamed it on the fact “the systems did not talk to each other”. 
 
 In a later statement, organisers said: “We apologise to any spectators who have had to queue on the first day of competition. We are fully aware of the problem and frustration it causes. We requested that the relevant authorities increase the speed and effectiveness that people can enter the park by requesting more employees to work on the x-ray machines. 
 
 “Following improvements the lines returned to normal by mid-morning. We appreciate the patience and understanding shown by fans and will use this experience to improve for the forthcoming days of competition.” 
 
 The Deodoro Stadium in the north of the city was almost entirely empty at 11am when rugby returned to the Olympics, except for a few small bands of travelling fans cowering in the shade. But it filled up a little before Brazil’s match against Great Britain, as a few hundred home fans turned out to cheer their team. 
 
 Greg Van Avermaet grabs gold amid the carnage in Rio 2016 road race Read more 
 
 At the morning swimming heats at the Aquatics Centre on the Olympic Park in Barra, about 20km from central Rio, the stands were roughly a third full. Venues started to fill up as the day went on and in previous Games, notably in Beijing, there have been empty seats in the first few days and stands have become fuller as the fortnight has gone on. 
 
 But there remains substantial scepticism over the official figure of 80%, or 4.9m, tickets having been sold. As revealed by the Guardian earlier this week, organisers outlined plans to give away ticket to schoolchildren. The first tranche will involve around 240,000 tickets at less popular sports such as rugby sevens and golf. 
 
 “As we have already reached 100% of our revenue target, where we have places available for some sessions, we will give the opportunity to students of our education programme, Transforma, volunteers, and other partner projects, as part of our engagement effort,” said a spokesman. 
 
 “We are conducting the first Olympic Games in South America and we want to take this opportunity to bring the sports and the athletes closer to the warmth of the young Brazilians.” 
 
 Organisers have also accelerated their advertising campaign to sell tickets for less popular sports under the slogan “There is emotion in every place”. 
 
 A spokesman said that there was a daily acceleration in sales and that they were relying on the fact Brazilians traditionally bought tickets at the last minute. 
 
 However, the website shows that tickets remain available not only for the football and less popular sports but for some of the blue riband events on the track and in the pool.
– It's been an eventful first two days for the Rio Olympics, but probably not in the way organizers were hoping. Brazilian police say an officer shot and killed a 22-year-old man who was attacking people as they left Maracana stadium Friday following the opening ceremony, USA Today reports. According to AFP, the man was mugging people. But reporters at the scene say it happened completely differently. They say people ducked for cover when gunshots rang out as thousands of people left the stadium. They then saw the shooter running into a nearby car and driving off. On Saturday, the Brazilian military executed a controlled explosion near the finish line of the men's road cycling race. They were blowing up a suspicious bag that had been left unattended, the Guardian reports. Officials say the bag may have belonged to a homeless man, but they had to take precautions. The racers were 60 miles away at the time, but the explosion "stunned" people hoping to watch the end of the race, according to AFP. The Sydney Morning Herald reports a bullet came ripping through the media room at the Deodora equestrian center and landed near a photographer Saturday. No one was hurt, but the bullet left a hole in the tent's roof. The venue is near a military base, and it's possible the bullet was accidentally fired toward the venue by someone on the base.