Ten people were killed and more than 20 were injured when an explosion tore through a train carriage in a St.Petersburg metro tunnel on Monday in what authorities called a probable terrorist attack
Russian news media said police were searching for a man recorded on surveillance cameras who was thought to have been involved in the attack, which coincided with a visit to the city by President Vladimir Putin.
Private television station Ren TV broadcast grainy pictures, it said were captured by a camera on board a metro train of a middle-aged man with a beard, a long black coat and black hat.
Closed-circuit footage from a few minutes later showed him outside the station hit by the blast, looking at his telephone.
Russia has been the target in the past of numerous bomb attacks, frequently targeting public transport. Most were blamed on Islamist rebels from Russia’s North Caucasus region. The rebellion there has been largely crushed, but security experts say Russia’s military intervention in Syria has made Russia a potential target for Islamic State attacks.
There was no immediate claim of responsibility.
Soon after the blast happened at 2:40 p.m., ambulances and fire engines descended on the concrete-and-glass Sennaya Ploshchad station. One helicopter hovered overhead, then landed on a broad avenue to take away an injured passenger.
“I saw a lot of smoke, a crowd making its way to the escalators, people with blood and other people’s insides on their clothes, bloody…