St Petersburg train blast: Surveillance cameras may have captured images of suspect

Surveillance cameras in St Petersburg's metro system may have captured images of the person suspected of organising Monday's deadly train blast, Russian news agency Interfax quoted a source as saying. "Images of the suspected organiser of the metro blast were captured on metro station cameras," the source said.

The explosive device may have been left in a briefcase in a metro train carriage, the source added.  At least 10 people were killed and 20 were injured when an explosion tore through a train carriage in the St.Petersburg metro system on Monday, the Russian National Anti-Terrorist Committee said.

Interfax news agency quoted an unnamed source as saying the blast, which occurred when the train was between two stations, was caused by a bomb filled with shrapnel.

President Vladimir Putin, who was in the city for a meeting with Belarus's leader, said he was considering all possible causes for the blast, including terrorism and was consulting with security services.