Two Central Asians suspected in St. Petersburg metro blast

Investigators in Russia are looking for two suspects, a man and a girl from Central Asia, in the wake of a bomb blast in the St Petersburg metro system, in which at least eleven people were killed and several others injured.

Russian state-owned news agency Tass quoted a source in the law enforcement agencies as saying that that the suspects came to the attention of law enforcers after checking records of video surveillance cameras.

The source citing preliminary data said that the suspects are natives of Central Asia, both aged about 20.

"Suspect profiles will be sent to police stations," the source added.

At least eleven people were killed and several others injured in an explosion inside a metro train at the Sennaya Square station in Russia's St. Petersburg.

According to the National Anti-terrorist Committee, the blast claimed 11 lives and injured forty-five people.

TASS news agency reported that an unidentified device exploded in a train car.

Russian Prime Minister Dmitry Medvedev called the St. Petersburg explosion a 'terrorist attack.'

"Those who suffered during the terrorist act in the St. Petersburg metro will be provided with all the necessary assistance. All instructions to the Ministry of Health and the Ministry of Emergency Situations are given. My most sincere condolences to the families and friends of the victims of the explosion. This is a common pain," Medvedev wrote on his Facebook page.

Russian President Vladmir Putin expressed his condolences and indicated that there will be an investigation with respect to the explosion.

Putin said he was in contact with the Federal Security Service (FSB) and law enforcement to determine the reason behind the explosion.

Seven metro stations in the city have been closed following the blast.