At least one person has been killed and five wounded in a shooting at the headquarters of Russia’s Federal Security Service (FSB) in central Moscow, Russian media say.
A gunman who opened fire with an automatic weapon at the entrance of the building was killed by an armed officer, Interfax news agency reports.
Security forces cordoned off the area and moved bystanders into buildings.
The shooting came hours after President Putin’s annual press conference.
The FSB denied earlier reports suggesting there were three gunmen in the attack on its headquarters. The unconfirmed reports said two had been killed in the lobby while the third ran off to a nearby building where he was later killed in a shootout with police.
One FSB officer was killed and at least two other officers were reported seriously wounded.
Russian investigators have opened criminal proceedings into the attempted murder of law enforcement officers.
They are looking into whether the attack was timed to coincide with Vladimir Putin’s four-hour press conference, which ended during the afternoon.
The attack took place on the eve of security services day – a special holiday for security staff – in Russia.