An explosion rocked a cargo ship carrying coal in Baltimore, causing a fire and sending a stream of smoke into the sky but leaving no injuries, authorities said Monday evening.

U.S. Coast Guard crews and firefighters from the city of Baltimore were among those who responded to the incident, and the fire was extinguished on the still-moving vessel, Coast Guard Petty Officer 1st Class Matthew West said.

The cause of the blast and subsequent fire was under investigation, he said. Video from the scene showed black smoke still billowing from the vessel, which authorities said is named W-Sapphire.

cargo ship explosion aftermath smoke
Smoke rises after an explosion on a cargo ship off Baltimore, Md., on Monday.Courtesy PeaceForJ @barcodeman

The cargo ship was carrying coal in a channel outbound from Baltimore Harbor near the site of last year’s Francis Scott Key Bridge collapse, West said.

In a statement, the Baltimore City Fire Department described the location as being in the “Patapsco River near the former Key Bridge site.”

It said 23 people were on board the 751 “bulk carrier” and none reported injury. The vessel, however, was “showing signs of damage consistent with a fire and explosion.”

The Coast Guard and fire department said the incident was reported about 6:30 p.m.

Authorities were maintaining a 500-yard safety zone around the cargo ship. That could preclude vessel traffic through the main shipping channel, which has been described as being 700 feet wide.

On March 26, a cargo ship drifted into the Francis Scott Key Bridge, causing partial collapse and killing six people, including road workers who had been atop the structure.