Asay says the explosion caused a small fire, but sprinklers doused it before crews arrived.
Classes were canceled and the building is expected to remain closed for hours.
Firefighters are investigating what chemicals were stored in the room.
Fire crews from four towns battled a fire at the Expera Mill in Old Town today.
Flames broke out in the number-four turbine area just after 10 this morning.
Firefighters arrived to find heavy smoke between the first and second floors.
We’re told oil and debris caught fire.