A man has died after attempting to save his sister and a friend as they struggled in the surf at a beach at New Brighton on Sunday afternoon.

Police said that shortly after 2pm a 14-year-old girl entered the waters of an unpatrolled beach at New Brighton and apparently became caught in a rip. The second 14-year-old girl then entered the water in an attempt to help her friend but also began to struggle.

The 35-year-old brother of one of the girls then entered the water and also encountered problems in the turbulent waters.

A number of people walking along the beach noticed the trio signalling for assistance and helped them from the water.

The man was dragged on to the shore where two passing registered nurses commenced resuscitation until the arrival of the ambulance. Officers continued to perform CPR, however the man died at the scene.

One of the girls was treated and released at hospital and the other was not injured.

A brief will be prepared for the information of the Coroner.