‘You can’t overlook any of these,’ Augusta’s superintendent said on Thursday at a public meeting at the high school, which has dealt with three threats this month.

Authorities say the likelihood of a link is remote, but Portland school officials want to know if radio frequency levels are elevated, particularly in Room 305.

Farrington Elementary School Principal Lori Smail resigned after the state’s announcement that it was invalidating results of tests taken by 106 students.