Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.AllNewsSportCultureLifestyleEmergency services have launched a multi-agency search operation (Testwood Lakes/Facebook)A 15-year-old boy is missing after he was last seen swimming at Testwood Lakes, near Totton, Southampton. Emergency services launched a multi-agency search operation after the alarm was raised at 1.35pm on Wednesday. Hampshire Constabulary confirmed police marine units, the National Police Air Service, South Central Ambulance Service, and Hampshire & Isle of Wight Fire Service are assisting in the search. The area around Testwood Lakes has been cordoned off and is currently off-limits to the public. The incident occurred on what was provisionally the hottest June day on record, with temperatures reaching 36C and extreme heat warnings issued across England. In fullEmergency services launch search operation after boy, 15, goes missing while swimming in lakeThank 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