Cargo ship that caused Baltimore bridge collapse had power blackout hours before leaving port

BALTIMORE — The cargo ship Dali experienced an electrical blackout about 10 hours before leaving the Port of Baltimore and yet again shortly before it slammed into the Francis Key Bridge and killed six construction workers, federal investigators said Tuesday, providing the most detailed account yet of the tragedy.

The power outage occurred after a crewmember mistakenly closed an exhaust damper, causing the ship’s engine to stall, investigators with the National Transportation Safety Board said in their preliminary report.