A murder investigation has been launched after a man in his 30s was discovered in a reservoir with a stab wound to the chest.
A 50-year-old man with links to Cornwall has been arrested on suspicion of murder after the body was found in Drift Service Reservoir near Penzance, on Thursday.
Police were called to the location when the man was spotted in the water in the afternoon.
Officers and paramedics performed CPR on the victim and discovered he had a suspected stab wound to his chest.
He was pronounced dead at the scene.
Police carried out enquiries in Cornwall and Warwickshire, and are still trying to identify and locate the casualty's next of kin.
Detective Inspector Steve Hambly, from the major crime investigation team at Devon and Cornwall Police, said: “We’re in the early stages of our investigation to establish the circumstances that led to the death of this man.
“Scene guards remain in place at locations in St Ives and Penzance whilst officers continue enquiries, and these are expected to remain in place over the weekend.
“I’m keen to hear from any members of the public who may have witnessed any suspicious behaviour in the area of Drift Reservoir or Lelant through the period between Monday 15 February and Thursday 18 February."