The investigations continue this morning into the cause of last week's big dig ceiling panel collapse.
State investigators say they have nearly finished collecting evidence from the Interstate 90 connector tunnel where the panels fell, crushing a car and killing a woman.
The panels have been reconstructed by state police, as the attorney general weighs whether criminal charges are possible.
The attorney general's office is one of more than a half dozen agencies investigating the accident.
The latest to open an investigation is the U.S. Inspector General's Office on the request of several members of the Massachusetts congressional delegation.
Among them was Representative Michael Capuano, who is on the House Transportation and Infrastructure Committee, and whose district includes sections of the central artery project.
Congressman Capuano Spoke to Bob Oakes from Washington, DC.
This program aired on July 20, 2006. The audio for this program is not available.