The Turkish police arrested five people in connection with the killing of Russian Ambassador Andrey Karlov, Turkish media reported Saturday.

Axar.az reports that, Putin Calls Ambassador Karlov’s Murder ‘Assault’ on Russia-Turkey Ties ANKARA. Four of the five arrested people were the killer’s colleagues, Turkish Karar daily reported citing police of the city of Izmir.

The fifth person is a member of the Fethullah Terrorist Organization (FETO), who had supervised FETO activists studying at a police school in Izmir, which Altintas attended, according to the report.

Karlov was shot dead on December 19 by off-duty police officer Mevlut Mert Altintas at the opening of an art gallery exhibition in the Turkish capital of Ankara. The gunman was killed at the scene by the police.