Federal, state and local law enforcement agencies are investigating bomb threats called into more than a dozen Massachusetts public schools Tuesday morning.
Massachusetts State Police confirmed threats were made to at least one school in Groton, Weymouth, Taunton, Arlington, Plymouth, Salisbury, Waltham, Ayer, Tewksbury, Newton, Billerica, Swampscott, Boston, Kingston and Westford (Nashoba Valley Tech).
The Massachusetts State Police Bomb Squad and other bomb technicians are responding to the threats, state police spokesman Dave Procopio said in a statement.
Some schools were already cleared by mid-Tuesday afternoon, he added.
The FBI is assisting state and local partners in identifying the source of the threats, Kristen Setera, media coordinator for the FBI, told WBUR.
Procopio said some of the threats were made by phone; of those, some were made through automated calls.
Tuesday's threats come after similar calls were made to schools last week.
State police confirmed they responded to bomb threats on Friday at schools in Falmouth, Bourne, Mashpee, Plymouth, Weymouth, Arlington and Boston (Boston College High School).