A man killed in a blast in an FSB security service building in northern Russia Wednesday was carrying an explosive device, Russia's anti-terrorism committee said.
"According to preliminary information, the person who came into the building took out of a bag an unidentified item which after a period of time exploded in his hands, as a result of which he sustained fatal injuries," it said in a statement.
Three FSB employees were injured in the blast, the committee added.
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