One FSB officer and one visitor were killed on spot and one was wounded. Security fired back, killing the attacker.
The FSB later identified the man as a local resident aged between 17 and 18 and said it had information that he was a member of neo-Nazi gang.
Social media users posted pictures of police cordons around the FSB building in Khabarovsk with special forces standing by.
#BREAKING: Russian intelligence building in #Khabarovsk attacked: Three people dead pic.twitter.com/oaaCzOfkny
— Amichai Stein (@AmichaiStein1) April 21, 2017
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