Three minors from Boston are facing charges in connection with making a prank threatening phone call that sent Billerica Memorial High School into lockdown on Thursday, Billerica police announced Friday.
Police began investigating a threatening phone call made to the high school around 1 p.m. on Thursday, police said in a press release. In accordance with established procedures, the school was put on lockdown.
Students were dismissed early as officers conducted an initial threat assessment, which eventually concluded that the threat was unfounded, police said. Meanwhile, police increased their presence at all schools across the town…