The gunman reportedly said ‘We die in Aleppo, you die here’ before opening fire and injuring Ambassador Andrei Karlov.
Russia’s ambassador to Turkey has been assassinated in front of terrified witnesses allegedly in retaliation for the crisis in Aleppo.
— Warfare Worldwide (@WarfareWW) December 19, 2016
The gunman reportedly shouted “Allahu Akbar” and said in Turkish “We die in Aleppo, you die here” during the shooting which left Ambassador Andrei Karlov dead.
The attacker was fatally shot by police after wounding Mr Karlov and at least three others, according to state TV.
Mr Karlov was delivering a speech at an art gallery in the capital of Ankara when the gunman fired a shot into the air and then shot the ambassador in a suspected radical Islamic attack, the Hurriyet newspaper reported.
— CNN Türk (@cnnturk) December 19, 2016
The assassination and aftermath were captured on camera, with video showing Mr Karlov speaking at a podium before falling to the floor as gunshots are heard.
Photos showed the attacker, wearing a black suit, standing behind Mr Karlov with his hands clasped before pulling out a handgun in his right hand and opening fire.
The gunman extended his right arm and pointed the gun at Mr Karlov, and then gestured with his left index finger pointed into the air after shooting the ambassador.
— RT (@RT_com) December 19, 2016
Photos and video published online by Turkish media showed Mr Karlov and a second person on the floor after being shot.
Three others were reportedly wounded as the shooting continued and people fled for their lives.
The gunman allegedly entered the gallery with police identification, and Mr Karlov reportedly did not have a security detail with him.
Mr Karlov was attending the opening of an exhibition at Ankara’s Centre for Contemporary Arts when the gun attack occurred.
The Kremlin said Russian President Vladimir Putin was holding an emergency meeting in the wake of the assassination.
The shooting occurred just days before Russia was set to host a meeting on the crisis in Syria.
Shortly after Mr Karlov’s death was announced governments around the world condemned the attack.
US State Department spokesman John Kirby said: “We condemn this act of violence, whatever its source.
“Our thoughts and prayers are with him and his family.”
Russia is Syria’s most powerful ally and has played a significant role in the Syrian government’s attempts to eradicate rebel groups across the country.
In recent weeks pro-government forces have made rapid advances on rebel-held territory in war-torn Aleppo, leaving many people dead or wounded.
After rebels were driven into an enclave in eastern Aleppo after heavy bombing a ceasefire was brokered by Russian and Turkish officials.
It included a plan to evacuate thousands of rebels and civilians, including women and children, from Aleppo to rebel-held territory in Idlib province in north-western Syria.