According to Bridgewater police, nothing was found at Bridgewater-Raynham Regional High School after a bomb threat was called in just after 10a.m. Thursday.
The high school was evacuated and three bomb sniffing K-9 units from the state police and the Quincy Police Department performed a search inside the school and outside.
No devices turned up but it was discovered that there was a mechanical problem with the fire alarm.
Due to the lengthy K-9 search and time needed to fix the fire alarm, students were released one-hour early.
Bridgewater police say the bomb threat is under investigation.