A bystander who has been filmed tackling and disarming an assailant during a shooting in which at least 11 people were killed at a Jewish holiday event in Sydney, Australia, has been praised as a hero whose actions may have saved lives.

Footage uploaded to social media on Sunday shows a man in a car park running up to a man holding a rifle. He then tackles the armed man, wrestles the rifle away from him and points the weapon back at him.

The video then shows the disarmed man losing his footing and backing away towards a bridge where another shooter was located while the bystander places the gun down on the ground.

One suspected attacker was killed and another was in a critical condition after the shooting while police said they were investigating whether a third gunman was involved.

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