http://www.bbc.co.uk/news/world-europe-39486640
Quote:The man suspected of killing 11 people in a St Petersburg train is in his early 20s and from Central Asia, Russian media report.
At least 45 people were injured in the explosion between two underground stations on Monday afternoon.
Another explosive device was found and made safe at a station nearby.
The Interfax and Tass news agencies said the suspect had been identified, but there are conflicting reports as to whether he was a suicide bomber.
Authorities in Saint Petersburg have declared three days of mourning for the victims.
President Vladimir Putin, who was in the city when the blast occurred, visited the scene on Monday evening and laid flowers at a makeshift shrine.
Russian investigators have described it as a suspected "act of terror" but they have given few details. No group has said it was responsible.
Prime Minister Dmitry Medvedev said in a Facebook post that the explosion was a "terrorist attack".
