A man set off a bomb at the entrance of the local branch of Russia's main intelligence agency in a northern Russian city Wednesday, injuring three security officials and killing himself, authorities said.
The man, who has not been identified, entered the local branch of the FSB intelligence agency in Akhangelsk and removed the bomb from a bag, causing it to detonate, the National Anti-Terrorist Committee said.
The explosion killed the man and injured three FSB officers. It was not immediately clear if the man had intended to leave the bomb or intended to die.
Akhangelsk governor Igor Orlov had earlier reported one death but did not indicate that that was the attacker. Authorities cordoned off the area around the FSB office and boosted security measures at all public offices in the city.