( CNN ) -- Russian President Vladimir Putin paid a New Year 's Day hospital visit to some of those injured in two suspected suicide bombings in the city of Volgograd . More than 30 people were killed in the attacks on Sunday and Monday at a rail station and on a trolley bus , just six weeks before Russia is due to host the Winter Olympics . Putin 's unannounced visit to Volgograd Wednesday came a day after he delivered a New Year 's message on Russian state TV in which he vowed to fight until terrorists were defeated . He met with regional security and police officials in the city , the state-run RIA Novosti news agency reported . `` The abomination of this crime , that was -- or crimes -- that were committed here , in Volgograd , do n't need any additional commentary , '' Putin said . `` No matter what motivated the criminals ' actions , there is no justification for committing crimes against civilians , especially against women and children . '' Putin then laid flowers at the scene of Monday 's attack , RIA Novosti said , before visiting a hospital to meet men and women undergoing treatment for their injuries . The blasts in Volgograd intensified fears of terrorism following a threat earlier this year from a Chechen extremist group to use `` maximum force '' to disrupt the February Olympic games in Sochi . No group has claimed responsibility for the attacks , described as suspected suicide bombings . 'Complete annihilation ' In his address Tuesday , Putin acknowledged problems in 2013 but said the Russian people had a lot to look forward to in 2014 . He also had a message for terrorists . `` We bow our heads to the victims of violent terrorist attacks . We will continue the fight against terrorists certainly , fiercely and consistently until their complete annihilation , '' he said . While security in Sochi and its surrounding area is considered to be very tight , the attacks in Volgograd , a major transportation hub for southern Russia , have raised concerns about the potential vulnerability of other areas of the country . Volgograd is a main transit point for people traveling by train to Sochi , a Black Sea resort situated just over 400 miles ( 645 kilometers ) to the southwest . The death toll from the two attacks rose to 34 Tuesday when some of those hurt died from their injuries , state media reported . The number of people killed in an explosion at the Volgograd 's main rail station Sunday now stands at 18 , RIA Novosti said , citing the Emergencies Ministry . Another 16 died following the blast on a trolleybus during the morning rush hour Monday , the news agency said , attributing the information to health officials . There was a strong security presence in Volgograd for the city 's New Year 's Eve celebrations . More than 3,000 police and dozens of volunteers were on the streets overnight , the state-run Itar-Tass news agency reported , citing the local branch of Russia 's Interior Ministry . Russian police earlier detained dozens of people in an anti-terror sweep in the city . It was n't clear if any of those held had any suspected connection to the attacks or would face any charges . International Olympic Committee President Thomas Bach voiced his confidence in Russia 's ability `` to deliver safe and secure Games in Sochi '' in a letter to Putin Monday . Putin 's amnesty . In what appeared to be a public relations offensive designed to improve his country 's image ahead of the Winter Olympics , Putin introduced a sweeping amnesty law last month . Among those to benefit were two members of Russian punk band Pussy Riot , who were allowed to leave prison . The amnesty also freed 28 protesters and two journalists who were thrown in prison after being arrested in September aboard a Greenpeace ship as they protested against drilling for fossil fuels in the Arctic . Putin also pardoned former oil tycoon and Kremlin critic Mikhail Khodorkovsky , who had been jailed since 2003 and was convicted in 2005 of tax evasion and fraud . The Russian president has also faced international criticism over anti-gay legislation passed in July that banned `` propaganda of nontraditional sexual relations around minors . '' In an apparent jab at the anti-gay laws , the United States announced that its delegation to the Winter Olympics would include openly gay athletes such as tennis legend Billie Jean King and hockey player Caitlin Cahow . CNN 's Jethro Mullen contributed to this report .
President Vladimir Putin meets with security officials , blast victims in Volgograd . `` There is no justification for committing crimes against civilians , '' Putin says . The two attacks in the space of 24 hours killed 34 people , state media say . The first suspected suicide blast hit Volgograd 's main rail station , the second a trolley bus .