Media playback is unsupported on your device Media caption The ANA flight made an emergency landing at Takamatsu 
 
 Japan's two main airlines have grounded their Boeing 787 Dreamliners after one was forced to make an emergency landing because of battery problems. 
 
 All Nippon Airways (ANA) grounded its fleet of 17 Dreamliners when its flight NH 692 from Yamaguchi Ube was forced to land shortly after take-off. 
 
 Japan Airlines followed suit, saying it would ground its fleet of seven 787s from 16 January until further notice. 
 
 This is the latest setback for Boeing and its problem-hit Dreamliner planes. 
 
 On Wall Street, shares in Boeing closed down more than 3% following the Japanese announcements on Wednesday. 
 
 In recent weeks, Dreamliners have suffered issues including fuel leaks, a cracked cockpit window, brake problems and an electrical fire. 
 
 Analysis There have been six separate safety incidents with Japanese-owned 787s in the last week and a half. But they are not all equal. The incident today was by far the most serious. Smoke inside an aircraft while in-flight is always a serious matter. That's why the plane was so quickly diverted, and probably why ANA and JAL have now ordered their fleets to be grounded. It also looks like this incident may not be isolated. It appears very similar to an electrical fire on board a Japan Airlines 787 in the United States last week. The source of that fire was the 787's lithium Ion battery pack. All the way back in 2007, the US Federal Aviation Administration expressed concern about the installation of Lithium Ion batteries on board the 787 because of their known problem with so-called "thermal runaway". It's a problem that has caused mobile phones and laptop computers to catch fire in the past. The 787 is not the only aircraft to use Lithium Ion battery packs. The Airbus A380 uses a smaller number. And the upcoming Airbus A350 will use a much larger number 
 
 "You're nearing the tipping point where they need to regard this as a serious crisis," said Richard Aboulafia, a senior analyst with the Teal Group in Fairfax, Virginia. 
 
 "This is going to change people's perception of the aircraft if they don't act quickly." 
 
 Battery malfunction 
 
 On Wednesday, ANA's flight NH 692 left Yamaguchi Ube in western Japan at 08:10 local time (23:10 GMT) and headed for Tokyo's Haneda airport. 
 
 Earlier reports that smoke was seen in the cockpit were inaccurate, ANA said. The pilots saw a warning on their computer screen telling them there was smoke inside one of the electrical compartments, the airline said. The source of the smoke is not yet known. 
 
 The pilots also received a warning that there was a fault in the battery system. ANA said the battery in the forward cargo hold was the same type as the one involved in a fire on another Dreamliner at a US airport last week. 
 
 The ANA flight landed at Takamatsu airport at 08:47 on Wednesday after the pilot saw an error message in the cockpit. 
 
 "There was a battery alert in the cockpit and there was an odd smell detected in the cockpit and cabin, and [the pilot] decided to make an emergency landing," said Osamu Shinobe, an ANA vice president, at a news conference. 
 
 ANA said that the 129 passengers and eight crew were evacuated, with a number of people sustaining minor injuries. 
 
 The Reuters news agency reported that five people were injured, while Bloomberg said that one person was sent to hospital. ANA officials were not immediately available to confirm the figures. 
 
 The BBC's correspondent in Tokyo, Rupert Wingfield-Hayes, said that local television footage showed emergency chutes were deployed from the plane. There were also fire trucks on the runway. 
 
 Paul Lewis, a spokesman for Boeing, told the BBC that the planemaker was "aware of the diversion of a 787 operated by ANA to Takamatsu in western Japan". 
 
 He added that Boeing "will be working with our customer and the appropriate regulatory agencies". 
 
 Dreamliner's technical problems 
 
 CLICKABLE Labels 
 
 Off 
 
 On Fuel tanks Electronics Engines Brakes Cockpit Fuel tanks 8 Jan 2013: Take-off aborted after about 150 litres of fuel spill from Japan Airlines Dreamliner in Boston 13 Jan: Same aircraft experiences another, separate fuel leak while undergoing tests in Tokyo Electronics 4 Dec 2012: A United Airlines 787 makes emergency landing in New Orleans after electrical problems 13 Dec: Qatar Airways 787 grounded after electrical power distribution problems 17 Dec: United finds electrical problem in second aircraft 7 Jan 2013: Fire starts in lithium ion battery pack of Japan Airlines 787 in Boston 8 Jan: United Airlines also finds faulty wiring to battery Engines July 2012: Fan shaft on engine fails during runway tests at Charleston International Airport 11 Jan 2013: Oil leak found in engine of All Nippon Airways 787 flight Brakes 9 Jan 2013: All Nippon Airways cancels flight when computer wrongly reports a brake problem Cockpit 11 Jan 2013: Cockpit window on an All Nippon Airways Dreamliner cracks during a Japanese domestic flight. The plane lands safely with no injuries 15 Jan: Another Dreamliner operated by ANA makes an emergency landing at Takamatsu in Japan after a smoke alert goes off 
 
 Market Reaction 
 
 The concerns have spread beyond Japan, however, not least because the Dreamliner was seen as Boeing's flagship new aeroplane and had attracted orders from many of the world's biggest and best-known airlines. 
 
 The 787 is said to be one of the most fuel-efficient in the industry, and Boeing delivered 46 Dreamliners to customers in 2012. 
 
 Following Wednesday's landing, India's aviation regulator said it would review the Dreamliner's safety and talk to parts makers. 
 
 The regulator said it was in contact with Boeing but as yet had no plans to ground the six Dreamliners that are currently being used by Air India. 
 
 Dreamliners in use Air India: 6 
 
 All Nippon Airways (Japan): 17 
 
 Ethiopian Airlines: 4 
 
 Japan Airlines: 7 
 
 LAN Airlines (Chile): 3 
 
 Lot Polish Airlines: 2 
 
 Qatar Airways: 5 
 
 United Airlines (US) 6 
 
 Total: 50 Source: Boeing 
 
 Australia's Qantas Airways said its order for 15 Dreamliners remained on track. Its subsidiary Jetstar is due to take delivery of the first of its aircraft in the second half of this year. 
 
 United Airlines is the only US carrier currently flying Dreamliners, and the carrier said it was not taking any immediate action. 
 
 Closer look 
 
 Even before Wednesday's emergency landing, Boeing was facing an inquiry by Japanese and US authorities over its Dreamliner issues. 
 
 Last week, the US Federal Aviation Administration started a joint review with Boeing of the design, manufacturing and assembly of the Dreamliner. 
 
 On Tuesday, Japanese authorities said they would conduct an inquiry after two successive fuel leaks on a different 787 operated by Japan Airlines. 
 
 On 8 January, Japan Airlines reported that a fire broke out on a 787 shortly after it landed in Boston. There have also been reports of brake issues. 
 
 Media playback is unsupported on your device Media caption Inside the cockpit of the Dreamliner 
 
 "It is not abnormal for new aircraft to have some teething problems," said Chris de Lavigne of Frost and Sullivan in Singapore. 
 
 "There were initial issues with the Airbus A380 as well. Look where it is today; it is flying successfully and everyone seems to be happy with it." 
 
 However, he added that a lot would depend on the outcome of the two investigations. 
 
 "If it turns out to be a major issue and requires re-engineering to be done, then you may need to ground some of the planes or even the entire fleet." ||||| Japan's largest airline, ANA, and its competitor JAL have each grounded their entire fleet of Boeing 787 Dreamliners after an emergency landing due to a smoke alarm in the cockpit – the most dramatic of a spate of incidents involving the troubled aircraft over the past week and since its inception. 
 
 All Nippon Airways said the plane had been evacuated, with its eight crew and all 129 passengers exiting safely on inflatable slides. Instruments in the cockpit indicated there had been a battery malfunction and the pilot had noticed a strange smell. 
 
 ANA said the plane diverted to Takamatsu, western Japan, at 8.45am on Wednesday. It had been bound for Haneda airport in Tokyo. 
 
 A spokesman for the Osaka airport authority said the plane had left Yamaguchi at 8am and made the emergency landing after the smoke alert. 
 
 The incident is certain to rock global airlines' confidence in the new aircraft, which went into commercial service just over a year ago after a three-year delay caused by design and production problems. 
 
 In the aftermath of the emergency landing, both ANA and JAL said they were grounding all their Dreamliners until satisfied they are safe to fly. The incidents have caused particular concern in Japan, the Dreamliner's biggest market, with ANA and Japan Airlines (JAL) flying 24 of the 50 planes to have rolled off the production line so far. 
 
 ANA is the biggest operator of the 787 in the world so far, having taken delivery of 17 aircraft including the first one flown commercially. 
 
 The aircraft has been hit by half a dozen incidents in the past week, including two fuel leaks, a battery fire, a wiring problem, a brake computer fault and a cracked cockpit window. Before that there had been engine failures during testing and in one case a Dreamliner cargo plane was forced to cancel takeoff when one of its General Electric turbines lost power. 
 
 US aviation officials said the aircraft was safe and it was not unusual for new models to experience minor mishaps, but the recent incidents have inevitably raised questions over the Dreamliner's safety. More than 800 Dreamliners have been ordered by airlines around the world. 
 
 The aircraft was supposed to have heralded a new era in commercial flight. Boeing officials say the plane, which is made of carbon fibre and other lightweight materials, is 20% more fuel-efficient than conventional airliners and 30% cheaper to maintain, and features design improvements for more comfortable medium and long-haul flights. 
 
 Boeing spokesman Marc Birtel told Reuters: "We've seen the reports, we're aware of the events and are working with our customer." 
 
 On Tuesday, Japan's transport ministry said it was launching an investigation into the cause of two fuel leaks on a JAL Dreamliner. That came after US transport authorities and Boeing started a joint investigation into the aircraft's manufacturing, design and assembly. 
 
 "Looking at this from the point of view of average citizens, having these sort of incidents occur seemingly day after day, one could become very uneasy," Akihiro Ota, Japan's transport minister, told reporters. 
 
 "We plan to look into the scale of these accidents and what the overall situation is. We will convey the message to those who operate [the plane] that it is absolutely necessary to be safe."
– Almost half the world's fleet of Dreamliners has been grounded after yet another incident, this time involving an emergency landing. All Nippon Airways and Japan Airlines announced they were taking the new Boeing aircraft out of service after an ANA flight was forced to land after a smoke alarm went off in the cockpit, the Guardian reports. Cockpit instruments said there had been a battery malfunction. There were several minor injuries as the 129 passengers and eight crew were evacuated from the aircraft. The ANA incident follows a host of other Dreamliner incidents in recent weeks, including a fire and two fuel leaks. The two Japanese airlines have 24 out of the 50 Dreamliners currently in service. More than 800 others have been ordered by airlines around the world, but Boeing is now facing a major image problem. "You're nearing the tipping point where they need to regard this as a serious crisis," an aviation analyst tells the BBC. "This is going to change people's perception of the aircraft if they don't act quickly."