The gunman shot and wounded a prominent Saudi Arabian cleric who was on an Islamic State hit list.
The lone gunman was shot dead by Qarni's security escort.
(Image grab from YouTube video)
The footage of the attack was run by the news channel MENSAHTV.
The preacher seated in his car was getting out of the venue waving to the people, the gunman appeared from the crowd in a grey hooded jacket and shot the preacher.
(Image grab from YouTube video)
People closer to the car panicked and started running.
(Image grab from YouTube video)
The gunman walked to the other side of the vehicle and shot the Saudi diplomat.
(Image grab from YouTube video)
Qarni was shot in the right shoulder, left arm and chest.