A 25-year-old man has died after jumping in a reservoir reportedly to collect a ball.
The man is understood to have got into difficulty after diving in to the Fens Pool in the West Midlands.
People battled to save his life at the scene and he was taken to hospital, where he later died, West Midlands Police said.
In a series of tweets, the force said: "Understood man dived in Middle Pool and failed to resurface. Resuscitation attempts at scene and taken to hospital.
"Sadly we've just heard that the man pulled from Fens Pool (Middle Pool) this evening has died in hospital. Condolences to family & friends."
Police are urging anyone who may have witnessed the accident, which happened around 6pm this evening, to contact them on 101.
Fens Pools are a biological site of Special Scientific Interest, and comprise of large reservoirs which are an important habitat for migrating birds.