by KYW's David Madden

US Defense Department investigators have concluded that two military helicopters at a Boeing factory in Ridley Township (Delaware County), Pa., were vandalized on the production line. And they are offering a reward in the case.
   
Federal officials were handing out fliers to workers at the Boeing Rotorcraft Systems plant listing a $5,000 reward for information concerning damage discovered in two H-47 Chinook helicopters (see related story).
   
"We have determined that this was a deliberate act and not an accident," said Ken Maupin, resident agent in charge of the Philadelphia area office of the Defense Criminal Investigative Service. He said 10 agents were investigating the case, but would not comment on specifics of the investigation or what led to the determination it was vandalism.
   
A production line at the plant has not been fully functional since Tuesday, when two workers found what the company called "irregularities" in the helicopters. US Rep. Joe Sestak (D-Pa.) has said he was told that wires in one helicopter appeared to be broken or severed, and a suspicious washer was found in the fuel tank of a second.
   
(File photo)