Russian Diplomat Assassinated on Camera in Turkey

PHOTO: An unnamed gunman gestures after shooting the Russian Ambassador to Turkey, Andrey Karlov, at a photo gallery in Ankara, Turkey, Dec. 19, 2016. PlayBurhan Ozbilici/AP Photo
WATCH Gunman Yells During Shooting of Russian Ambassador to Turkey

Russia's ambassador to Turkey was shot dead today when a lone gunman fired at him at a photo exhibition in Ankara, Turkey's capital, a Russian Foreign Ministry spokeswoman confirmed to ABC News. The attack was caught on camera.

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Andrey Karlov, the ambassador, died from his wounds, she said, adding that Russia was calling the shooting a terrorist attack.

“Don’t forget Aleppo, don’t forget Syria. Don’t forget Aleppo, don’t forget Syria," the gunman yelled in Turkish during the attack. "Until these places are safe you will not taste any safety either.”

Images of the gunman, who has been identified as Mevlut Mert Altintas, show a thin man with dark hair gripping his pistol tightly with both hands.

Altintas, 22, was a member of the riot police in Ankara, which enabled him to enter the building through the use of his police ID card, according to Interior Ministry sources.

Burhan Ozbilici, a photographer for The Associated Press, witnessed the shooting, and wrote an account of it for the agency.

"The event was routine enough -- the opening of an exhibit of photographs of Russia — and when a man on stage pulled out a gun I thought it was a theatrical flourish," Ozbilici wrote about the incident. "It was anything but. Moments later the Russian ambassador was sprawled on the floor and the attacker was waving his gun at the rest of us, shouting slogans."

Altintas was ultimately killed by the Turkish anti-terror police, the Interior Ministry said. The ambassador was already dead by the time he arrived at the hospital, they added.

Three other people were injured during the incident but are said to be recovering.

Altintas' mother and sister were taken into custody in the city of Izmir after the shooting.

PHOTO: A man identified as Mevlut Mert Altintas gestures near to the body of a man at a photo gallery in Ankara, Turkey, Dec. 19, 2016. An Associated Press photographer says a gunman has fired shots at the Russian ambassador to Turkey. Burhan Ozbilici/AP Photo
A man identified as Mevlut Mert Altintas gestures near to the body of a man at a photo gallery in Ankara, Turkey, Dec. 19, 2016. An Associated Press photographer says a gunman has fired shots at the Russian ambassador to Turkey.

According to Russia's state news agency, Tass, witnesses said Karlov was shot in the back by Altintas after he gave a speech at the Museum of Modern Art.

In a statement, the White House said the attack on Karlov was "heinous."

"The United States strongly condemns the assassination of the Russian ambassador to Turkey ... which reportedly also left others wounded. Our thoughts and prayers are with the families and loved ones of Ambassador Karlov and the other victims, and we offer our condolences to the Russian people and Government. This heinous attack on a member of the diplomatic corps is unacceptable, and we stand united with Russia and Turkey in our determination to confront terrorism in all of its forms," according to the statement.

President-elect Donald Trump also issued a statement offering condolences "to the family and loved ones of Russian Ambassador to Turkey Andrei Karlov, who was assassinated by a radical Islamic terrorist."

Russia's Foreign Ministry in a statement said the purpose of the attack was to weaken efforts by Russia and Turkey to improve relations and reach a political settlement in Syria.

"We strongly condemn this inhuman crime, which has the aim to undermine collective efforts to reach political settlement in Syria and the process of normalization of Russian-Turkish relations," the statement said.

Russia also said it expects close cooperation from Turkey in the investigation of the shooting.

"We expect the close cooperation from the Turkish authorities with representatives of the Russian investigative authorities to conduct a thorough investigation of all the circumstances of the barbaric crime, identify and punish the organizers, as well as the adoption of the most effective measures to ensure the security of Russian citizens, diplomatic missions and their personnel," the foreign ministry's statement said.

Karlov, 62, was a career diplomat, according to The Associated Press. He joined the diplomatic service in 1976.

He served as Russia's ambassador to North Korea from 2001 to 2006 and later worked as the chief of the Foreign Ministry's consular department. He served as the ambassador to Turkey since 2013.

Protests of Russia's role in the Syrian war have been prominent in Turkey.

The governments of both countries have collaborated to evacuate civilians from war-torn Aleppo.

PHOTO: Turkish police secure the area near an art gallery where the Russian Ambassador to Turkey, Andrei Karlov was shot, in Ankara, Turkey, Dec. 19, 2016. Umit Bektas/Reuters
Turkish police secure the area near an art gallery where the Russian Ambassador to Turkey, Andrei Karlov was shot, in Ankara, Turkey, Dec. 19, 2016.

Turkish President Tayyip Receo Erdogan and his Russian counterpart, Vladimir Putin, spoke by telephone about Aleppo on Sunday and emphasized the need to swiftly overcome disruptions to the city's evacuation, sources in Erdogan's office told Reuters.

Turkey has suffered numerous terrorist attacks in recent years, the most prominent of which have been bombings.

Among those attacks were a suicide attack at a wedding this August and coordinated shootings and bombings of Istanbul's major international airport in June.

Both those attacks killed scores of civilians.

ABC News' Patrick Reevell and The Associated Press contributed to this report.