Update 3:20 p.m.: Police have cleared Bishop McGann-Mercy High School. There was no explosive device on the premises, Riverhead Police Lt. David Lessard said. Riverhead and state police conducted a thorough search of the buildings, he said. The campus was cleared for occupancy about two hours after the false report was made to school officials.

Original story:

Bishop McGann-Mercy High School in Riverhead has been evacuated following a bomb threat this afternoon.

An unknown person called the school at 1:10 p.m. and said there was a bomb in the building. School officials immediately evacuated the building and called police, Riverhead Police Lt. David Lessard said.

“N.Y. State Police are responding to the scene with a bomb dog to assist with a search of the building,” Lessard said.

Students, faculty and staff were released for the day since the incident took place near the end of the regular school day, police said.

Police have the school campus sealed off. Riverhead Fire Department was also called to the scene as a result of someone in the school pulling a fire alarm in response to the phoned-in threat, police said.

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Denise is a veteran local reporter, editor, attorney and former Riverhead Town councilwoman. Her work has been recognized with numerous awards, including investigative reporting and writer of the year awards from the N.Y. Press Association. She is a founder, owner and co-publisher of this website.Email Denise.