WATCH: Graphic video shows assassination of Russian ambassador

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>>>UPDATE: Turkish police arrest man who fired shots outside U.S. Embassy; unsure of connection to ambassador's shooting

Russian Ambassador Andrei Karlov was giving a speech Monday in the Turkish capital, Ankara, when a man wearing a suit and tie stood up, shouted and fired at least eight shots, according to an Associated Press photographer in the audience.

A Russian official later informed that Karlov was pronounced dead after being treated for multiple gunshot wounds.