Gunfire erupted Monday at a photo exhibit in Ankara, Turkey, where Russia's ambassador was one of the speakers, wounding the diplomat and others, Turkish media reported.

The private television channel NTV described the injuries to Ambassador Andrei Karlov as serious. The identities of the others reported wounded was not immediately clear.

There was no immediate claim of responsibility for the attack, and a motive was unclear. But Russia is a key backer of Syrian President Bashar Assad and has taken part in attacks on Syrian rebels, who have extensive networks in Turkey.

CNN Turk television reported that shooting continued after the attack targeting the ambassador.

The attack occurred at a photo exhibition in the capital, Ankara. The Associated Press published a photo showing a man lying on the ground with an armed assailant dressed in a suit standing nearby.