updated 7/28/2008 2:32:33 PM ET 2008-07-28T18:32:33

Authorities in Minnesota said no one was hurt when a 1,200-pound chunk of concrete tumbled onto highway traffic.

They said the slab tore off the underside of an overpass in St. Paul over the weekend. The 6-foot-by-9-foot section fell onto two vehicles.

More than eight hours of gridlock followed along Interstate 35E as crews inspected the overpass, which shuttles nearly 140,000 motorists a day through downtown St. Paul. Authorities say the 50-year-old bridge is "structurally safe."

The incident comes nearly a year after the deadly collapse of a Mississippi River bridge in neighboring Minneapolis. The St. Paul bridge isn't scheduled to be replaced until 2014.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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