Surfers in South Australia say they have witnessed a pod of killer whales attacking a school of more than 100 dolphins.

One of the surfers on lower Eyre Peninsula, Jamie Kidney, says the attack was an incredible sight.

"Chaos, you just saw monstrous amounts of white water and then a dolphin would go flying in the air, a killer whale would jump out of the water, grab it and body slam it," he said.

"They were just jumping out the water attacking dolphins and it was just chaos really.

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