Washington, July 9 (ANI): Usher's 11-year-old stepson Kyle Glover has been declared brain dead following a tragic Jet Ski accident on Friday.

The singer's celebrity friends showed their support on Twitter following the horrific accident.

The son of Usher's ex-wife Tameka Foster, was enjoying a day on Atlanta's Lake Lanier, riding on an inner tube with a 15-year-old girl, when they were struck by a man riding jet skis on Friday, according to police.

Both children were immediately air-lifted to Children's Healthcare at Egelston Hospital in Atlanta.

Everyone PLEASE pray for Usher and Tameka's son! This is the time they really need your prayers, the New York Daily News quoted singer Fantasia as tweeting on Saturday.

Praying that Usher and Tameka's son is ok... Russell Simmons added.

The cause of the horrific incident is still under investigation, which could take months to complete.

Sources told TMZ, that Glover has not experienced any brain activity since he was admitted to the hospital and there has been no decision yet as to whether or not to take him off life support. (ANI)