Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Monday condemned the assassination of Andrei Karlov, Russia's ambassador to Turkey.

“Today we offer our condolences to the family and loved ones of Russian Ambassador to Turkey Andrei Karlov, who was assassinated by a radical Islamic terrorist," Trump said in a statement.

"The murder of an ambassador is a violation of all rules of civilized order and must be universally condemned.”

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Karlov was shot and killed at an art gallery in Ankara.

Russia's Foreign Ministry said it considers the shooting to be a terrorist attack.

According to an Associated Press photographer who was at the gallery, Karlov was several minutes into a speech when a man in a suit and tie entered, shouted “Allahu Akbar” — meaning "God is the greatest" in Arabic — and fired several shots. He also reportedly said some words in Russian and smashed several of the photos on display.

The gunman also shouted "Don't forget about Syria, don't forget about Aleppo!" according to Reuters.

Sputnik News identified the shooter as Mevlüt Mert Altıntaş, a former police officer. Altıntaş, 22, was reportedly investigated as part of the July coup attempt in Turkey fired from the force.

The gunman was killed at the scene.