Russia Bus Attack: Bomb Blast 'Kills At Least 14' In Volgograd, Day After Deadly Train Station Explosion (VIDEO)

Second Deadly Blast Hits Russian City Ahead Of 2014 Sochi Olympics
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An ambulance leaves the site of a trolleybus explosion in Volgograd, Russia, Monday, Dec. 30, 2013. The explosion left 10 people dead Monday, a day after a suicide bombing that killed at least 17 at the city's main railway. The explosions put the city on edge and highlighted the terrorist threat that Russia is facing as it prepares to host the Winter Games in February. Volgograd is about 650 kilometers (400 miles) northeast of Sochi, where the Olympics are to be held. (AP Photo/Denis Tyrin)
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At least 14 people have reportedly been killed after a bomb blast ripped through a crowded trolleybus in the second deadly attack in the Russian city of Volgograd in two days.

Investigators have described the blast, targeting a bus packed with morning commuters, as "an act of terror".

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State TV footage showed the twisted, gutted remains of the blue-and-white trolleybus, its roof blown off and debris strewn around the street.

The National Anti-Terrorism Committee said the bus explosion was most likely caused by a bomb, but there were no further details.

Russian investigators have said the bus explosion was caused by a male suicide bomber.

A statement from the Federal Investigative Committee said: "It is now possible to preliminarily say that the explosive device was set off by a suicide bomber - a man whose body fragments have been collected and sent for genetic testing."

It comes just a day after a female suicide bomber was blamed for killing 17 people and leaving dozens more injured at the city's main railway station.

The consecutive attacks have dramatically underscored Russia's vulnerability to militants – raising fears of a concerted campaign of violence before the Sochi Olympic Games, which start next month.

Russians have reacted with horror to the attacks, with the writer Sergey Minaev posting online: "It's like someone has declared a war on us."

Police have identified the first bomber as a Dagestan national called Oksana Aslanova - who had been married to two Islamists killed by Russian forces.

She apparently detonated a bomb in front of a metal detector inside the main entrance of the station. Russian television is suggesting there may have been two attackers.

A video has emerged of the terrifying moment the female suicide bomber blew herself up:

Story continues below:

There was no immediate claim of responsibility for either of the attacks.

In July, Doku Umarov, leader of an ongoing insurgency in the nearby North Caucasus region, urged militants to use "maximum force" to disrupt the Winter Olympics, a project close to Russian President Vladimir Putin's heart.

Russian authorities have pledged to make the event the "safest ever".

GRAPHIC WARNING: Double explosions hit Russia
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Russian firefighters and security personnel inspect the destroyed trolleybus in Volgograd on December 30, 2013. Ten people were killed in a bombing that destroyed a packed trolleybus in the southern Russian city of Volgograd, the second attack in the city in two days after a suicide strike on its main train station, officials said. AFP PHOTO (Photo credit should read STRINGER/AFP/Getty Images) (credit:Getty Images)
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Experts and police officers examine a site of a trolleybus explosion, background, in Volgograd, Russia Monday, Dec. 30, 2013. The explosion on the trolleybus left at least 10 people dead Monday, a day after a suicide bombing that killed at least 17 at the city's main railway. (AP Photo/Denis Tyrin) (credit:AP)
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An ambulance leaves the site of a trolleybus explosion in Volgograd, Russia, Monday, Dec. 30, 2013. The explosion left 10 people dead Monday, a day after a suicide bombing that killed at least 17 at the city's main railway. The explosions put the city on edge and highlighted the terrorist threat that Russia is facing as it prepares to host the Winter Games in February. Volgograd is about 650 kilometers (400 miles) northeast of Sochi, where the Olympics are to be held. (AP Photo/Denis Tyrin) (credit:AP)
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A destroyed trolleybus stands on a street in Volgograd on December 30, 2013 after ten people were killed in a bombing on the packed vehicle, the second attack in the city in two days after a suicide strike on its main train station, officials said. The new attack will further heighten fears about security at the Winter Olympic Games which are due to open on February 7 in Russia's Black Sea resort of Sochi, which lies 690 kilometres (425 miles) southwest of Volgograd. AFP PHOTO (Photo credit should read STR/AFP/Getty Images) (credit:Getty Images)
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GRAPHIC CONTENTDead bodies lie at the scene where a destroyed trolleybus stands on a street in Volgograd on December 30, 2013 after ten people were killed in a bombing on the packed vehicle, the second attack in the city in two days after a suicide strike on its main train station, officials said. The new attack will further heighten fears about security at the Winter Olympic Games which are due to open on February 7 in Russia's Black Sea resort of Sochi, which lies 690 kilometres (425 miles) southwest of Volgograd. AFP PHOTO (Photo credit should read STR/AFP/Getty Images) (credit:Getty Images)
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Ambulances line up a site of a trolleybus explosion, background, in Volgograd, Russia Monday, Dec. 30, 2013. A bomb blast tore through the trolleybus in the city Volgograd on Monday morning, killing at least 10 people a day after a suicide bombing that killed at 17 at the citys main railway station. (AP Photo/Denis Tyrin) (credit:AP)
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Experts and police officers examine a site of a trolleybus explosion in Volgograd, Russia Monday, Dec. 30, 2013. A bomb blast tore through the trolleybus in the city of Volgograd on Monday morning, killing at least 10 people a day after a suicide bombing that killed at 17 at the citys main railway station. (AP Photo/Denis Tyrin) (credit:AP)
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Ambulances line up a site of a trolleybus explosion, background, in Volgograd, Russia Monday, Dec. 30, 2013. A bomb blast tore through the trolleybus in the city Volgograd on Monday morning, killing at least 10 people a day after a suicide bombing that killed at 17 at the citys main railway station. (AP Photo/Denis Tyrin) (credit:AP)
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Experts, firefighters and police officers examine a site of a trolleybus explosion in Volgograd, Russia Monday, Dec. 30, 2013. A bomb blast tore through the trolleybus in the city of Volgograd on Monday morning, killing at least 10 people a day after a suicide bombing that killed at 17 at the citys main railway station. (AP Photo/Denis Tyrin) (credit:AP)
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Locates Volgograd, Russia, where a suicide bomber attacked trolleybus; 1c x 2 1/2 inches; 46.5 mm x 63 mm; (credit:AP)
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Police officers with a sniffing dog examine territory around the site of a trolleybus explosion in Volgograd, Russia, Monday, Dec. 30, 2013. The explosion left 10 people dead Monday, a day after a suicide bombing that killed at least 17 at the city's main railway. The explosions put the city on edge and highlighted the terrorist threat that Russia is facing as it prepares to host the Winter Games in February. Volgograd is about 650 kilometers (400 miles) northeast of Sochi, where the Olympics are to be held. (AP Photo/Denis Tyrin) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, bodies lie at an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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A police officer guards a main entrance to the Volgograd railway station hit by an explosion, in Volgograd, Russia, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a female suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo) (credit:AP)
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In this photo made by a public camera and made available by the Associated Press Television News the flash of an explosion illuminates the entrance to Volgograd railway station in Volgograd Russia on Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/ Associated Press Television News) (credit:AP)
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In this photo made by a public camera and made available by the Associated Press Television News smoke pours out after an explosion at Volgograd railway station, in Volograd Russia on Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/ Associated Press Television News) (credit:AP)
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A police officer guards a main entrance to the Volgograd railway station hit by an explosion, in Volgograd, Russia, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a female suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, debris lies outside an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, emergency services approach a square outside a main entrance of the Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, a policeman stands by the cordoned off area of the Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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A police officer guards a main entrance to the Volgograd railway station hit by an explosion, in Volgograd, Russia, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a female suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, ambulance vehicles line up to a main entrance of Volgograd railway station , Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, bodies lie at an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, medics help wounded people, at an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, debris lies outside an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, bodies lie at an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, debris lies outside an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, medics help wounded people, at an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's Office Handout) (credit:AP)
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In this photo taken on a cell phone, made available by Volgograd Mayor's Office, medics help wounded people, at an entrance to Volgograd railway station, Sunday, Dec. 29, 2013. More then a dozen people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, officials said, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi. (AP Photo/Nikita Baryshev,Volgograd Mayor's office Handout) (credit:AP)
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Russian police investigators collect evidence following a suicide attack at a train station in the Volga River city of Volgograd, about 900 kms (560 miles) southeast of Moscow, on December 29, 2013. A female suicide bomber killed 14 people when she blew herself up at the main train station in the southern city of Volgograd, raising concerns about security in Russia just six weeks before the Sochi Olympic Games. AFP PHOTO / STRINGER (Photo credit should read STRINGER/AFP/Getty Images) (credit:Getty Images)