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The National Transportation Safety Board on Saturday interviewed members of the construction company that was resurfacing the bridge when it collapsed, NTSB Chairman Mark Rosenker said at his third daily briefing since the accident. He also said that officials can begin to remove cars and bridge debris.
Ever since the 40-year-old bridge fell, questions have arisen about whether the bridge work had anything to do with the collapse. Photos at the time show a sand pile, a tanker truck and a concrete mixer on the bridge. Also, workers had been using jackhammers, and a first-responder at the collapse said workers told him the bridge had been wobbling unusually days before.
Investigators have mapped the bridge, Rosenker said, and today they will take high-resolution pictures via helicopter.
State inspections began Friday at three Minnesota bridges with designs similar to the I-35W bridge. Bridges near St. Cloud, Sandstone and Osceola, Wis., received positive grades. Inspections started Saturday on a Sauk Rapids bridge and will begin today on one over the Gooseberry River on the North Shore of Lake Superior.
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