Three people suffered non life-threatening injuries this morning in an explosion at the McDonogh School in Owings Mills.

Two patients -- an adult and a child -- were transported to local hospitals. The third, an adult, was treated at the scene. Both adults had been working in the boiler room area, where the explosion occurred.

Baltimore County Fire Department units were dispatched to the private preparatory school in the 8600 block of McDonogh Rd., 21117, at 8:31 a.m. for a report of an explosion at the "shot tower" -- a smokestack connected to a boiler room.

First-arriving crews found the top of the shot tower blown off and bricks from the tower strewn in the vicinity. BCoFD personnel immediately set up a collapse zone and searched adjacent structures for trapped victims; the search was negative. 

The two employees working in the boiler room, as well as students and employees in nearby buildings, self-evacuated. 

There was no fire as a result of the explosion. About 20 pieces of fire equipment responded to this call.

Maryland Occupational Safety and Health (MOSH) was dispatched and will handle the investigation.