Three teenage boys are accused of assaulting staff members at Acadia Hospital.
Bangor Police say their investigation began Wednesday night.
Responders say four staff members were treated and released for non-life threatening injuries at a nearby emergency room.
Two 14-year-olds, one from Bangor, another from Jay, were arrested for Felony Aggravated Assault.
They’re being held to Mountain View Youth Development Center in Charleston.
A 17-year-old from Bangor has been summoned for 4 separate Misdemeanor Assault charges and remains at the facility.