A broken sensor beam tripped the fire alarm at James Caldwell High school this morning, forcing the evacuation of students and staff.

According to an email sent to parents and guardians from Vice Principal Jim Brown, the building was evacuated at 10:56 a.m. after maintenance staff working in the rear auxiliary gym accidently broke one of the sensor beams, signaling the alarm.

After members of the West Caldwell Police Department and Fire Department confirmed the building was safe, students and staff returned at approximately 11:05 a.m.