Minneapolis ? The massive job of removing bridge debris and smashed cars from the site of the collapsed Interstate 35W bridge will begin today, but a final report on the cause of the disaster will take longer than expected – up to a year and a half – because of challenges posed by the wreckage and the Mississippi River.

The announcement came as Minnesota Department of Transportation officials said that they had hired a St. Paul contractor for the cleanup, expected to cost up to $15 million.

As thousands surveyed the bridge wreckage Sunday from the reopened Stone Arch Bridge, searchers reported finding no new victims to add to the list of five confirmed dead.