A gunman has shot dead Russia's ambassador to Turkey, Andrei Karlov, apparently in protest at Russia's involvement in the Syrian conflict.
Several other people were reportedly also injured in the attack, a day after protests in Turkey over Russia's military intervention in Syria.
According to Russian TV, the ambassador had been attending an exhibition called "Russia as seen by Turks".
Police later "neutralised" the gunman, reports say, without giving details.
Mr Karlov was rushed to hospital, reports said, but his death was later confirmed by the Russian foreign ministry.