AYER (CBS) – Two workers were hurt in an explosion and fire at an industrial building in Ayer Friday afternoon.
One worker was seriously injured and taken to the hospital by MedFlight. Another worker was not as severely hurt.
The explosion occurred at Advanced Vacuum Systems on Fitchburg Road, a company that makes specialty furnace equipment.
According to the State Fire Marshal, a preliminary investigation points to a failure of a pressure seal as the cause of the explosion.
Two firefighters suffered minor injuries battling the fire.
Investigators from OSHA are at the scene.