A London park has been evacuated after a teenage boy went missing after getting into difficulty in the water.
The incident took place in Beckenham Place Park, south-east London, on Friday afternoon.
Friday has been the hottest day of the year so far for much of the country.
Officers said: "Police were called at 15:08hrs on Friday, 04 April to Beckenham Place park.
"A 16-year-old boy is believed to have got into difficulty in the water and is now missing.
"Emergency services are currently co-ordinating a search.
"The next of kin has been informed and are currently being supported by specialist officers.
"The park has been evacuated to facilitate the search."
Lewisham Council, the local authority, said: "We are aware of a serious incident at Beckenham Place Park.
"Council staff are supporting the Police on site. The park is currently closed."