Twenty-four students were taken to the hospital Saturday night after an auditorium stage collapsed during a performance in California.

Investigators say the stage at Servite High School in Anaheim collapsed because of excessive weight, and a lot of jumping. About 250 girls from Rosary High School, Servite’s sister Catholic school, were on the stage at the time.

Anaheim Police Department spokesman Lt. Tim Schmidt said their early investigation suggests “the front of the stage gave out due to weight.”

About 24 students suffered “minor to moderate” injuries, the worst being broken bones, Schmidt said.

A total of 300 to 400 students and parents were in the auditorium at the time of the collapse, officials said.