Update 11:50 AM
Boise Fire Chief Dennis Doan says there were two explosions at an underground Micron utility room. Doan says seven workers were injured, all with minor injuries, the worst of which was a laceration to the arm.
Doan reports no chemicals or hazardous materials were released as a result of the explosion.
Emergency responders are in the process of packing up to leave.
We'll have more on this story during All Things Considered beginning at 3:30.