Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.AllNewsSportCultureLifestyleAn urgent search is underway for an 11-year-old boy (PA)An urgent search is underway for an 11-year-old boy who went missing after entering the River Don in Mexborough, South Yorkshire. Police were called at 7.59pm on Saturday after witnesses saw the boy enter the water but not re-emerge. A multi-agency operation involving South Yorkshire Police, fire and rescue, ambulance, air service, and an underwater search team is actively looking for him. The boy's family has been informed and is receiving support from specially trained officers. Authorities have urged the public to avoid the search area and refrain from spectating or filming, noting the incident occurs amidst a heatwave that has seen multiple water-related deaths across the UK. In fullUrgent search for boy, 11, missing after entering river in South YorkshireThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in

The boy was seen entering the River Don in Mexborough and police were called at 7.59pm on Saturday

Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.AllNewsSportCultureLifestyleAn urgent search is underway for an…

A huge search and rescue mission is underway at a river spot in South Yorkshire after a child was seen entering the river but did not reappear

Police were called at 7.59pm on Saturday after the schoolboy was seen in the River Don near Ferry Boat Lane in Mexborough but was not spotted getting out.

An 11-year-old boy who disappeared after entering the River Don in Yorkshire has been named, with police saying he 'could not have survived' being in the water this long

The boy has not been seen since Saturday, May 30, when it is believed he entered the River Don in Mexborough.

Mackenzie Swift entered the River Don on Saturday evening

Mackenzie Swift (pictured) was last seen entering the River Don, near Mexborough, South Yorkshire, on Saturday evening.