A teenage boy has died after going into the sea in Skegness, Lincolnshire.
Police described him as “a child under the age of 16”, saying that he was in the water at around 6.15pm on Saturday.
A search was carried out by officers and the coastguard, with the boy’s body found at around 11.30pm.
No further details have been given about the youngster or how he got into difficulty in the water.
Superintendent Lee Pache said: “We received a high volume of calls for missing people on the coast yesterday.
“At one point, within two hours, we received 10 calls.
“All of those who were reported missing, other than the child who sadly died, were located safe and well.
“Our thoughts are with the boy’s family.”
His death was confirmed after a body was also found in a Doncaster lake on Saturday.
Emergency services received reports of a man in his 20s in difficulty at Lakeside lake at around 4.10pm, South Yorkshire Police said.
A body was recovered hours later.
Temperatures this weekend have pushed towards the mid-30s in parts of the UK, prompting many people to head to coastal areas to cool off.
Late last week, Gareth Morrison, head of water safety at the Royal National Lifeboat Institution (RNLI), said: “With so many people enjoying the water this summer, it’s important that we all know the risks.
“If you get into trouble in the water, Float to Live – lean back, using your arms and legs to stay afloat.
“Control your breathing, then call for help or swim to safety.
“In a coastal emergency, call 999 or 112 for the coastguard.”
He added: “Record numbers are also taking to the water on craft such as paddleboards and kayaks, many for the first time. It’s important to always remember to wear a lifejacket or buoyancy aid and to take a means of calling for help.”