WASHINGTON (AP) - Workers at Boeing’s suburban Philadelphia helicopter plant reported to work Wednesday even as Army criminal investigators and others looked into possible irregularities discovered in two military helicopters made at the plant.

The company shut down the H-47 Chinook helicopter line at the Boeing Rotorcraft Systems plant in Ridley Township, Pa., on Tuesday, but it disclosed few specifics about why. The line had not fully resumed operations as of Wednesday morning, the company said.

U.S. Rep. Joe Sestak, a Democrat whose district includes the plant, said he was told during a briefing that wires that appeared to be broken or severed were found in one helicopter and a suspicious washer was found in a second.

Sestak said the assessment was preliminary and he expected the findings of a more thorough review would be available on Wednesday. He praised Boeing’s handling of the situation, and said it was much too early to speculate on what happened.