Authorities say crash involving multiple vehicles and injuries closed all lanes on the heavily-traveled U.S. 50 Bay Bridge in Maryland, snarling traffic and causing major delays for about six hours. The Maryland Transportation Authority said Saturday on social media that the morning crash on the westbound lanes has closed the bridge. The transportation authority said in a later post that eastbound and westbound traffic were alternating turns on the eastbound bridge, but the westbound bridge remained closed. Westbound lanes reopened Saturday afternoon. Authorities say several people were taken to area hospitals. The bridge crosses the Chesapeake Bay. It connects Maryland’s Eastern Shore and the metropolitan areas of Baltimore, Annapolis and Washington.