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 murder of Russian diplomat Andrey Karlov will not bring the Syrian civil war any closer to an end, Defence Secretary Sir Michael Fallon said.
Sir Michael told MPs the shooting was a "shocking act involving a diplomat who should otherwise, of course, enjoy proper protection".
He added: "His murder does not bring any conflict in the Middle East further to a resolution."
The gunman who shot Karlov was heard to shout "Don't forget Aleppo! Don't Forget Syria".
"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.