A one-year-old baby boy has died after reportedly drowning in a hot tub at a house in Sussex.
Police were called to the scene in Central Avenue, Findon Valley, in Worthing, at just before 1pm.
The tot received emergency treatment from paramedics and an air ambulance crew but it was not enough to save him.
A local resident claimed the tot was discovered dead in the hot tub.
Neighbours in Central Avenue, Worthing, told how they saw the air ambulance helicopter land shortly after 1pm today.
Doctors were seen rushing to the garden of a house in the street where other children were understood to have been present.
One man, who asked not to be named, said: "There were a lot of emergency services at the scene - ambulances, the helicopter, police cars, the lot.
"From what I have been told it sounds like a terrible tragedy has happened.
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"I was told by another neighbour that a little boy had been found dead in a hot tub in the garden. Whether the lid was on it or how he got into there, I don't know. You have got to feel desperately sorry for his family."
A spokesman for Sussex Police said: "We were called to a property in Central Avenue, Worthing, at 12.57pm following concerns for the welfare of a one-year-old boy.
"The boy was taken to hospital by ambulance staff where he sadly died. Full circumstances surrounding the death are being investigated and the matter has been passed to the Coroner's Officer.
"Next of kin have been informed and support is being provided to the family."
A spokesman for the South East Coast Ambulance Service said: "I can confirm we attended a medical incident at a private address in Findom Valley. A call came in at just after 12.30pm today.
"We have withdrawn from the scene completely now, the air ambulance would have landed in the nearest open space nearby to assist us at that call. Due to patient confidentiality we wouldn't comment on the details."
Central to the police investigation was likely to be how the one-year-old got into the hot tub.
His body was taken to the mortuary at Worthing Hospital where a paediatric pathologist was expected to carry out a post mortem examination on his body to try to ascertain the exact cause of his death. He was believed to have suffered a cardiac arrest.
An inquest will be opened and adjourned to a later date by the West Sussex coroner Penelope Schofield.
