Celtics fans fight on MBTA’s Red Line following loss against San Antonio Spurs

MASSACHUSETTS — An investigation is underway following a fight caught on video involving about a dozen Boston Celtics fans on the MBTA’s Red Line, transit police announced.

The brawl broke out at around 11pm Wednesday following the Celtics’ loss to the San Antonio Spurs at TD Garden.

What prompted the fight is unclear at this time.