Police in Massachusetts responded to 32 schools for threats on Thursday morning.
Officers responded to schools in Andover, Arlington, Billerica, Brookline, Chelmsford, Danvers, Dracut, Littleton, Lynn, Marblehead, Melrose, Methuen, Needham, Peabody, Stoneham, Tewksbury, Ludlow, Tyngsborough, Woburn. for threats.
The Massachusetts State Police confirmed 32 schools in Massachusetts recieved robo-call threats.
The department released a statement informing citizens that the threats are being tracked but "no hazardous devices have been found at any sites as of this time."
The Department of Fire Services said they were "assessing each threat and the appropriate local response."
According to the Arlington Police Department, officials swept Arlington High School and students returned to class.
Officers also responded to Arlington Catholic High School.
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The threat at Littleton High School was also unfounded and the shelter in place was lifted.
Danvers Superintendent Lisa Dana released a statement to parents informing them that Danvers High School was evacuated due to a threat.
The statement also said, "after careful evaluation, it was determine that the situation was a low level threat...we continue to be vigilant as we ensure the safety of our faculty and students."
According to the Andover Police Department, Andover High School staff and students were evacuated while the building was searched by fire officials.
Officials determined there was no danger and everyone returned.
Multiple threats were reported in more than a dozen schools on Monday morning as well.