A massive explosion at a train station in the Russian city of Volgograd killed at least 16 people , including one police officer , the Investigative Committee of Russia said on its website Sunday . See photos of the blast . The head of the committee , Vladimir Markin , said 16 people had been killed and 34 people were injured , including a 9-year-old girl . The suspected female suicide bomber set off the device before she could pass through a metal detector , Markin said , citing available information at the time . Later , Markin told Russian news agency Ria Novosti the remains of the bomber will undergo DNA testing . He said the bomber used the equivalent of 10 kilograms of TNT and included shrapnel . Investigators also found an unexploded grenade . Video taken from an outside security camera shows a huge fireball inside what appears to be the main entrance of the three-story stone building followed by a steady trail of smoke coming out shattered windows . The bombing occurred at about 12:45 p.m. local time ( 3:45 a.m . ET ) , officials said . President Vladimir Putin posted a message on the Kremlin 's website sending his condolences to the family of those killed and wishing a quick recovery to those hurt . Prime Minister Dmitry Medvedev ordered the emergency and health ministries to provide `` all necessary assistance '' to the wounded . Ria Novosti reported that the regional governor said at least half of the wounded are in critical condition . It is the second bombing in the southern Russian city in two months and comes less than six weeks ahead of the Winter Olympics in Sochi , located less than 1,000 kilometers ( 620 miles ) from Volgograd . No one has claimed responsibility for the attack . `` There can be no justification for such barbarous attacks . '' said NATO Secretary General Anders Fogh Rasmussen . `` NATO and Russia stand together in the fight against terrorism. , including by working together on technology to prevent attacks on public transport systems . '' A White House spokeswoman said , `` Our hearts go out to the victims and their families . '' In October , a bomber blew up a passenger bus , killing six people and wounding more than 30 others . Russian media reported that a female Islamist suicide bomber from the Russian region of Dagestan was responsible for the attack . Volgograd , once called Stalingrad , is a major rail hub in the region , and each day thousands of passengers pass through the station , many on their way to Moscow . The station likely was packed with holiday travelers . The restive region of Chechnya is also located in this southern portion of Russia .
Russian news agency says remains of bomber to be examined . Russia authorities say preliminary information points to a female suicide bomber . Video appears to show explosion inside the main doors to the station . Bomber reportedly was approaching metal detector when attack occurred .