BALTIMORE — A crane appeared at the site of a collapsed highway bridge in Baltimore as crews prepared March 29 to begin clearing wreckage that has stymied the search for four missing workers.

BALTIMORE — Massive barges carrying cranes streamed toward Baltimore on March 28 to begin the challenging work of removing metal and concrete in an attempt to open a key shipping route.

BALTIMORE — Within about 90 seconds of a dispatcher's warning of an impending crash, police officers who happened to be near the Francis Scott Key Bridge stopped traffic in both directions.