A major search is underway for a fully-clothed man who walked into the sea and vanished.
The alarm was raised after the mystery man was seen to stroll into the sea in darkness on Sunday evening.
A search helicopter was scrambled and used spotlights to locate the man in the water off the Dorset coast in Portland, but by the time a boat reached him, he had disappeared beneath the surface.
Police said that the man was known to have been wearing white trainers, black skinny jeans, a black tee-shirt and a grey hooded top tied around his waist.
Officers were called at 10.21pm on Sunday evening to reports that a man had entered the water near the area of Church Ope Cove.
A spokesman for Dorset Police said: "Officers, the National Police Air Search helicopter and other emergency services, including the ambulance service, the RNLI, HM Coastguard and Dorset Search and Rescue Service, all attended the scene.
"The NPAS helicopter identified a man in the water, but at 11.04pm it was reported he had disappeared from view. Extensive searches are being carried out both on land and at sea to try and locate the man.
"He is described as white, 5ft 9ins tall, with short hair and of medium build."
Chief Inspector Neil Wright, of Dorset Police, said: "This was a fast moving incident and we are working with HM Coastguard, which has primacy for searching as he was last seen in the water.
"I would urge anyone who witnessed the incident, or has seen a man matching the description given, to please contact Dorset Police immediately."
