The police also suspect that the explosion was caused by an Improvised Explosive Device or IED.
Moscow:
"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 nine people were killed and 20 were injured when an explosion tore through a train carriage in the St. Petersburg metro system on Monday.
(Reporting by Alexander Winning, Writing by Sujata Rao)
© Thomson Reuters 2017
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
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