What we know about the Baltimore bridge collapse

By BEN FINLEY and JAMES POLLARD
Associated Press

Authorities are gathering evidence about what led to this week’s bridge collapse in Baltimore. So far, we know that a massive cargo ship lost power and issued a mayday call moments before it struck the Francis Scott Key Bridge early Tuesday, causing the span to crumble into the Patapsco River. Eight construction workers were filling potholes on the bridge when the crash happened. Two were rescued soon after the collapse. Divers recovered the bodies of two others, and the other four are presumed dead. Ship traffic has been halted at the Port of Baltimore, which handles tens of billions of dollars in cargo each year.