Brookfield High School dismissed early because of a threat, according to school officials.
The bomb threat was found in a girls bathroom, according to the superintendent.
It was found on Thursday morning. A student told a faculty member, who then informed the school resource officer.
The officer contacted detectives and an investigation began.
Students and staff were evacuated.
Police determined that the threat was credible and school was dismissed for the day. Buses arrived to take the students home.
Officers and firefighters were going through the building as of 11:15 a.m.
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