WILMINGTON, Del. -- A tractor-trailer cab crashed through a concrete barrier Friday and plunged off the Delaware Memorial Bridge into the Delaware River, authorities said. It wasn't clear how many people were in the cab, which was found in about 20 feet of water, according to the Delaware River Bay and Authority.

The cab of a tractor-trailer with no trailer attached “crashed right through the concrete wall,” after crossing 3 lanes of traffic, said a public information officer for the Delaware River and Bay