Reporters and players reportedly evacuated TD Garden. No one was injured, and the cause of the fire alarm is currently under investigation.

The staggering loss came two nights after the Knicks erased an identical 20-point deficit to take Game 1 in overtime. In franchise history, the Celtics have dropped the first two games of 18 best-of-seven series, and they went on to lose 16 of those.

Mikal Bridges scored all of his 14 points in the fourth quarter before making his second straight game-clinching steal, and the New York Knicks overcame a 20-point deficit again to beat the Boston Celtics 91-90 on Wednesday night for a 2-0 lead in the Eastern Conference semifinals.