Russia's Investigative Committee on Tuesday said that they suspected a suicide bomber was behind the attack in the Saint Petersburg metro Monday that killed 14 people and injured dozens.
Investigators said in a statement that "it has been established that the explosive device could have been activated by a man whose fragmented remains were discovered in the third carriage" of the train. It was not immediately clear whether he counted among the dead.
Flowers are placed at a symbolic memorial at Tekhnologichesky Institute subway station in St Petersburg, Russia