PETERBOROUGH, N.H. (AP) - An employee at a New Hampshire ball bearings plant where an explosion injured at least 15 people says he heard a bang, felt a rumble and saw snow blown off the plant's roof.
New Hampshire Ball Bearings Inc. machine operator Paul Clark says he was outside when he heard the explosion Monday afternoon. He says his girlfriend was inside the plant in Peterborough. He says shelves fell off the walls in the department where his girlfriend works but she wasn't injured.
Company spokeswoman Kathy Gerrity says it's unclear what caused the explosion.
A local hospital spokeswoman says two injured people have been flown to other hospitals for more treatment and the rest have been released.
New Hampshire Ball Bearings' corporate headquarters are in Chatsworth, Calif. It's a division of Japanese company Minebea.
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