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In all, 88 vehicles have been located, both in the river and amid the broken concrete wreckage of the bridge, according to the State Patrol.

NTSB investigators have been trying to pinpoint where on the bridge the collapse began. Observations from a helicopter camera yesterday found several “tensile fractures” in the superstructure on the north side of the bridge, but nothing that appeared to show where the collapse began, the NTSB said.

Investigators were still working to verify the loads and stresses on the beams, as well as materials in the plates.

They also were looking into reports of wobbling before the collapse.

The company that was doing construction work at the site, Progressive Contractors Inc., rejected a report that a worker noticed unusual swaying of the bridge in the days before its collapse. The company said it didn’t believe any of its work contributed to the bridge failure but hadn’t responded directly to claims of wobbling.

“We have now met with every single worker who was on the bridge when it collapsed,” Tom Sloan, vice president of the company’s bridge division, said in a news release yesterday. “None of them observed or reported any unusual swaying.”

The eight people reported missing and feared dead in the bridge collapse have been identified as Christine Sacorafas, 45, of White Bear Lake; Vera Peck, 50, and her son Richard Chit, 20, both of Bloomington; Greg Jolstad, 45, of Mora; Peter Hausmann, 47, of Rosemount; Sadiya Sahal, 23, of St. Paul, and her 2-year-old daughter, Hanah; and Scott Sathers, 29, of Maple Grove.