A 14-year-old boy has died after jumping into a stretch of the River Thames marked as a "no swimming" zone during a heatwave, according to the Daily Mail. The tragedy adds to concerns about the risks of open-water swimming as high temperatures prompt more people, particularly young people, to cool off in rivers and lakes despite warnings against doing so.

The available article text does not provide further specific details of the incident, such as the exact location, the circumstances of the boy's death, or the emergency response. Authorities and safety campaigners regularly warn that rivers can be deceptively dangerous, with strong currents, cold water and hidden hazards contributing to fatalities during periods of hot weather.