Contractors -- not miners -- were replacing an airshaft at the face of the mine when the accident occurred, said Gibson County coal mine superintendent Jim Brown.
Police said the accident occurred about 11 a.m.
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"At this point we have people trying to retrieve the bodies and we know there was no explosion," said Mike Hurt of the Princeton police.
The mine is operated by Gibson County Coal. Princeton is located in southwestern Indiana north of Evansville. E-mail to a friend