India, May 31 -- A night of celebration turned tragic for a San Antonio Spurs fan after a 17-year-old boy suffered catastrophic injuries while marking the team's playoff success, according to local reports.

The teenager, whose identity has not been publicly released, was declared brain dead after falling from a moving vehicle during celebrations following the Spurs' Western Conference Finals Game 6 victory over the Oklahoma City Thunder on Thursday, News 4 San Antonio reported.

The win forced a decisive Game 7 in the series and sparked celebrations across the city.

According to relatives cited by local media, the teen was celebrating the Spurs' victory when he fell from a moving vehicle and struck his head.

He was initially taken to a...