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State Police responded to the campus and the district asked all parents to stay away from the school.
According to Superintendent Joseph Hochreiter, the school received an anonymous phone call from a man who threatened the school, demanding money.
A school secretary and assistant principal both participated in the call, trying to get the individual to explain what exactly he wanted, but he continued an obscene rant and eventually hung up, Hochreiter said.
Principal James Mackin immediately put the building on lockdown and contacted the New York State Police, Hochreiter said.
Twenty New York State Troopers were on the grounds. Troopers recommended moving students to the gymnasium and the classrooms were evacuated in floor order, starting with the top floor. Staff and faculty members assisted throughout this process, Hochreiter said.
A complete sweep of the building was made using a canine unit. Transportation Director Elizabeth Gilleo made sure that Frank G. Lindsey students were able to leave school on their regular buses, and kept enough buses on hand so that high school students could be sent home by bus at about 4 p.m.
All afternoon and evening events at Frank G. Lindsey, Blue Mountain Middle School, and Hendrick Hudson High School were canceled.
The school was locked down on Tuesday after a threatening phone call and an incident of vandalism, Hochreiter said in a posting on the school's Facebook page.
Students were dismissed shortly after the lockdown ended, Hochreiter said. State police and other agencies assisted in conducting a thorough sweep of the school and deemed it same for dismissal, said Hochreiter.
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