Police have detained six people over the killing of the Russian ambassador to Turkey in Ankara, state media said.
While giving a speech at an art gallery yesterday, ambassador Andrei Karlov was shot in the back by an off-duty police officer who shouted "Don't forget Aleppo" and "Allahu Akbar".
The state-run Anadolu agency said the attacker's mother, father, sister and two other relatives were held in the western province of Aydin, while his flatmate in Ankara was also detained.
A video showed the attacker shouting: "Don't forget Aleppo, don't forget Syria!" and "Allahu Akbar" ("God is Greatest") as screams rang out.
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He paced about and shouted as he held the gun in one hand and waved his other hand in the air.
Police remain at the scene outside the art gallery where the shooting took place.
The United States said its three missions in Turkey would be closed today after a gun was fired in front of the US embassy in Ankara overnight.
The embassy is near the art gallery where Mr Karlov was shot and Turkish police detained a man over the incident, state media reported.
Russia's foreign ministry has said the Russian and Turkish foreign ministers, in a phone call overnight, had underlined the need to put more effort into effectively fighting terrorism.
The Russian, Turkish and Iranian foreign ministers will meet in Moscow later to discuss the crisis in Syria.
A Russian delegation is due to arrive in Ankara this morning to conduct investigations into the attack, broadcaster CNNTurk reported.
Turkey faces multiple security threats, including from the so-called Islamic State militant group.
It has been repairing ties with Moscow after shooting down a Russian warplane over Syria last year.
Russia is an ally of Syrian President Bashar al-Assad and its air strikes helped Syrian forces end rebel resistance last week in the northern city of Aleppo.
