This happened a few weeks ago elsewhere.
Via NBC:
Five New Jersey High Schools received bomb threats Friday morning and at least two were evacuated, authorities said.
Teaneck High School, Bergenfield High School, Waldwich High School, Mahwah High School and Hackensack High School all received threats, according to Bergen County authorities.
Teaneck High School and Bergenfield High School were evacuated after the threats, authorities said.
A robocall from the Teaneck High School’s superintendent advised parents of the threat and said all students were being evacuated to the Rodda Community Center as a precaution.