Family members of the Turkish gunman who shot dead Russian ambassador Andrei Karlov have been released from police questioning.
A number of relatives of Mevlut Mert Altintas were taken into custody earlier this week as police attempted to establish the background to the shooting.
Karlov, the ambassador to Turkey, was shot in the back by Altintas, himself a member of security, as the Russian was giving a speech on Monday.
The assassination of the Russian ambassador to Turkey will not hinder the Syria peace deal, the Kremlin said.
Russian President Vladimir Putin has ordered intelligence services to step up security for Russian embassies abroad.
But at the moment there are no plans to evacuate Russian diplomats from Turkey.
A group of Russian investigators have already arrived in Ankara, the Kremlin added.
"It was like a movie", says Burhan Ozbilici, who captured the moment Mevlut Mert Altintas shot and killed Andrey Karlov.
Andrey Karlov has been killed in a gun attack at a photo exhibition in the Turkish capital Ankara.