Amaq News Agency, an IS propaganda arm, made the claim in a brief report in Arabic distributed on the social media application Telegram that cited a "security source."
According to the text translated into English by the SITE monitoring group, the source said an IS "fighter" attacked an FSB office in Khabarovsk yesterday, killing three people and wounding others.
Russian officials say two people were killed in the incident -- an FSB employee and a civilian. One other person was reported wounded.
The Amaq report came one day after the Islamic State group claimed an attack in Paris that left a policeman dead and two other officers wounded.
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