From the Maine Department of Education:

Update on Active Shooter Threats

Dear Champions of Education,

The Department of Public Safety is aware of multiple active shooter threats that have been made at schools throughout the state. Maine State Police have been assisting local law enforcement agencies with these initial investigations.

At this time these reports are believed to be a hoax. The Maine Information Analysis Center (MIAC) is heavily involved in coordinating these investigations.

https://mailchi.mp/maine/cu5lemq6y0-1325383?e=437c80956e