BALTIMORE (AP) — The U.S. Coast Guard has opened a temporary, alternate channel for vessels involved in clearing debris from the collapsed Francis Scott Key Bridge in Baltimore, part of a phased approach to opening the main shipping channel leading to the vital port, officials said Monday. Crews are undertaking the complicated work of removing steel and concrete at the site of the bridge’s deadly collapse after a container ship lost power and crashed into a supporting column. On Sunday, dive teams surveyed parts of the bridge and checked the ship, and workers in lifts used torches to cut above…