Police have named the 11-year-old boy who went missing in the River Don in South Yorkshire, as the search for him continues.
Mackenzie Swift has not been seen since he entered the water at around 8pm on Saturday, and his family have been told by South Yorkshire police that he could not have survived in the water.
The force said that his family were "living every parent's worst nightmare", with searches including an underwater team and Mountain Rescue volunteers, as well as emergency crews from the National Police Air Service, Yorkshire Ambulance Service and South Yorkshire Fire and Rescue Service.
Officers will remain at the site overnight, police said, with further searches resuming on Tuesday morning.
In a statement shared on Facebook on Monday afternoon, South Yorkshire Police said: “While we are doing everything we can to find him, our family liaison officers have sadly had the heartbreaking conversation with Mackenzie’s family that if he had not exited the river on Saturday, he could not have survived in the water for this length of time.
“Sadly none of our inquiries so far have found any indication that he got out of the water.”
Doncaster District Commander Chief Superintendent Pete Thorp said: “We will continue to do everything in our power to find Mackenzie and to support his family through this incredibly difficult time. They truly are living every parent’s worst nightmare.
“We are utilising a range of specialist resources and organisations from across the region.
"I understand members of the public are desperate to help, but I must ask that you leave this work to the professional search teams.
"Please do not put yourselves or others in danger by searching in and around water, and if asked to leave by officers, please understand this is for your own safety and to ensure our efforts focus solely on finding Mackenzie."
There have been at least 15 water-related deaths in the UK following the recent heatwave.
On Sunday evening, a 13-year-old girl was pulled from the River Wharfe in Burnsall, near Skipton, North Yorkshire.
North Yorkshire Police said that she was airlifted to hospital where she was pronounced dead..
44-year-old Greg Howes died following an incident on the River Yare at Surlingham, Norfolk on Friday.
Norfolk Constabulary issued a family tribute, which read: “Greg was dearly loved by his family and loved spending time on the Norfolk Broads. At this sad time, his family would like to urge the public to take care and consider their safety when taking part in activities on the water on the Broads.”
A 15-year-old girl from Cheshire died in hospital on Saturday after getting into difficulties in the sea off the coast of Merseyside on Bank Holiday Monday, while a woman in her 60s died on Saturday after she and a man got into difficulty after entering the water in Thornton Cleveleys to "rescue their dog".
Record May temperatures were recorded in England and Wales last week, but it has dropped to average for the time of year with thunderstorms and cooler temperatures expected.
