HAVERTOWN, Pa. (CBS) – An online threat forced Haverford High School in Delaware County to shelter in place Monday morning.

Officials at the school say a student told the principal about the unspecified internet threat. The principal then put the “Shelter in Place” in effect and contacted police.

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Authorities searched the building and say they found no threat and the shelter in place was lifted after an hour, just before 10 a.m.

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Officials say students and staff followed the safety protocol they practiced all throughout the school year.

Haverford police continue to investigate and three officers will stay on campus for the day.

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