The presidents of Russia and Turkey have agreed there will be a joint investigation into the murder of Moscow's ambassador in Ankara.

Andrei Karlov was shot by an off-duty police officer at an art gallery yesterday.

Witnesses say the killer shouted "don't forget Aleppo" - a reference to the Kremlin's policy of supporting President Assad in the conflict in Syria.

Vladimir Putin is promising to get answers:

Meanwhile, The United States has closed offices in Ankara for the day after a shooting outside the American embassy in the Turkish capital.

Someone opened fire after approaching the main gate.

No-one was hurt and an arrest was made.