Video uploaded online of Sunday's shooting at Ten X Nightclub in Calgary depicts the speed with which the attack was carried out and then halted by the quick actions of security staff and police.

The CCTV footage shows a white car pull up outside the bar. A man exits the front passenger side, carrying a pistol in his right hand. He flips up a hood over his head, walks to the front door and fires through the glass.

Police arrested two men — Mohamed Elmi, 31, and Mohamed Salad, 29, both of Calgary — and charged them with numerous offences, including attempted murder.