BALTIMORE (AP) — Investigators on Tuesday were trying to determine what caused an explosion aboard a cargo ship laden with coal as it departed Baltimore’s harbor for East Africa.

Officials said no one was injured in the blast Monday evening, which prompted a mayday call when it was reported near the site of last year’s Francis Scott Key Bridge collapse. Video of the explosion showed flames shooting high into the air, followed by a large plume of dark smoke billowing over the Patapsco River.

The Port of Baltimore’s main shipping channel was closed Tuesday morning.

“The U.S. Coast Guard is the lead agency in the response and will determine when the channel can safely reopen, as well as the timing of vessel arrivals and departures,” port officials said in a news release.

The 751-foot (229

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