Police are at the scene of a shark attack at Port Noarlunga.

About 9.45am today (Thursday 15 May), emergency services were called to the Port Noarlunga jetty after reports that a man swimming in the water had been bitten by a shark.

He was helped from the water and treated at the scene by paramedics before he was taken to hospital in a serious condition.

Swimmers have been evacuated from the water.

Please avoid the area.