A blast ripped through a supermarket in the Russian city of St Petersburg on Wednesday evening. Photograph:( Twitter )
A blast ripped through a supermarket in the Russian city of St Petersburg on Wednesday evening, injuring four people, Russian news agencies reported.
"A homemade explosive device with the power equivalent to 200 grammes of TNT filled with lethal fragments went off in a Saint Petersburg shopping centre," Investigative Committee spokeswoman Svetlana Petrenko told Russian news agencies.
Nobody was killed in the explosion, but there were unconfirmed reports of a further 10 people being injured.
Russian news agencies reported that investigators have opened a criminal case on the grounds of attempted murder.