St. Petersburg explosion: Death toll rises to 11, at least 45 injured
The explosion also left 45 others injured.
The Russian authorities have identified the killer, a man in his 20's, local Tass news agency reported.
Following the incident, St Petersburg authorities have declared a three-day mourning.
Meanwhile, world leaders have condemned the incident.
Condoling the loss, Prime Minister Narendra Modi had tweeted on Monday, "Deeply saddened by the loss of lives in the blasts at St. Petersburg metro. Heartfelt condolences to the families of the victims."
Extending his support, US President Donald trump spoke to his Russian counterpart Valdimir Putin by phone.
"Both President Trump and President Putin agreed that terrorism must be decisively and quickly defeated," a White House statement read.
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