A frantic search has been launched for a teenage boy last seen getting into difficulty in the river Thames.
Police said on Facebook that officers were at the river between Bourne End, Buckinghamshire and Cookham, Berkshire on Monday.
The force received a report at around 3pm that a boy had entered the water and got into difficulty.
He was not seen to leave the water, prompting a search by police and the fire service.
There will be a police presence in the area while the hunt takes place, a statement added.
Several people have commented on the post stating that they hope the boy is found safe and well.
And one woman said: "My niece witnessed it and has come home with her 3 girls.. all in shock.
"She said the boy was having so much fun with his friends."
Bank Holiday Monday marked the hottest day of the year in Britain so far.
Pictures taken across the nation have shown people making the most of the weather, on beaches, in parks and by rivers.
