UPDATE 12:00 p.m.
According to Boise Police, an explosion involving a piece of Micron research and development equipment erupted just before 10 a.m. this morning, two floors below ground level in building 24 D at Micron's Boise campus.
Approximately 200 people who worked in the building were evacuated. All but a handful of the employees have returned to work.
Four workers, two Micron employees and two electrical contractors were injured - one suffered a minor cut to his arm, two are being evaluated for ringing in their ears and a fourth inhaled dust during the blast. Three other workers were also being evaluated after breathing dust. None required hospitalization.
Boise Fire Haz Mat experts were able to confirm no hazardous chemicals were released as a result of the explosion.
Micron will continue to investigate the cause of the explosion.
ORIGINAL POST 11:00 a.m.
Boise Fire and Police are on the scene of an explosion at Micron's Boise plant.
Ada County dispatchers said a possible explosion was reported at 9:52 a.m.
Boise Fire Chief Dennis Doan reported, via Twitter, that a piece of research and development equipment exploded inside one of the Micron labs. At least three Micron employees were being evaluated for minor injuries.