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.
Turkish police have detained a man who fired shots outside the US embassy in Ankara just hours after the Russian ambassador to Turkey was assassinated.
The man took out a pump action shotgun he hid in his coat and fired around eight shots in the air, police said.
No one was hurt as the embassy's security guards overpowered the gunman.
The US embassy is located just across the street from the art gallery where Russian ambassador Andrey Karlov was shot and killed as he gave a speech on Monday night.
Turkish policeman Mevlut Mert Altintas, who was later shot and killed by police, has been named as the gunman.
Altinas is said to have shouted "don't forget Aleppo" during the attack, appearing to condemn Russia's military role in 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.