Russian ambassador shot dead in Ankara gallery

The Russian foreign ministry confirmed the death of envoy Andrei Karlov, calling it a "terrorist act". Relations between Moscow and Ankara have long been strained over the conflict in Syria, with the two support opposing sides in the war.

Russia is an ally of Syrian President Bashar al-Assad and its air strikes helped Syrian forces end rebel resistance last week in the northern city of Aleppo. Turkey, which seeks Assad's ouster, has been repairing ties with Moscow after shooting down a Russian warplane over Syria last year.  

The Ankara mayor said on Twitter the gunman as a 22-year-old police officer. Two security sources told Reuters he was not on duty at the time.

The attacker was smartly dressed in black suit and tie and stood, alone, behind the ambassador as he made a speech at the art exhibition, a person at the scene told Reuters.

"He took out his gun and shot the ambassador from behind. We saw him lying on the floor and then we ran out," said the witness, who asked not to be identified. People took refuge in adjoining rooms as the shooting continued.

A video showed the attacker shouting: "Don't forget Aleppo, don't forget Syria!" and "Allahu Akbar (God is Greatest) as screams rang out. He paced about and shouted as he held the gun in one hand and waved the other in the air.

A Reuters cameraman at the scene said gunfire rang out for some time after the attack. Turkey's Anadolu news agency said the gunman had been "neutralized", apparently killed.

Reuters