Three people have been taken to hospital after getting into difficulty at Helens Bay Beach, Belfast Coastguard has said.
In a statement, they said several onlookers attempted to rescue the trio - with one person entering the water.
A Coastguard helicopter, RNLI lifeboat and ambulances all took part in the operation at Belfast Lough.
The Coastguard has asked anyone at the scene, who was affected by the incident, to contact them.
