SHADY GROVE, Pa. — Two men killed in an accident at a Pennsylvania crane manufacturer have been identified but few details about the accident have been released.

Chris Robison, 49, of Marion and John Marcoux, 66, of Chambersburg both died of multiple blunt force trauma, Coroner Jeffrey Conner of Franklin County said Sunday.

Another man was flown to a hospital with critical injuries following Friday morning’s accident at Manitowoc Cranes in Shady Grove, about 65 miles southwest of Harrisburg.

Two other men had minor hand and arm injuries, Trooper Brent Miller of the state police said Friday. He said he was unable to provide more details.

The U.S. Occupational Safety and Health Administration is among those investigating along with state police, the company and the coroner’s office.

Manitowoc, based in Manitowoc, Wis., has about 1,200 employees at the Antrim Township plant, which makes Grove mobile cranes and recently added an assembly line for crawler cranes.