A boat explosion injured at least 10 people in Chesapeake City on Saturday afternoon, officials said.

The explosion happened around 4 p.m. at Schaefers Canal House, a restaurant on the Chesapeake & Delaware Canal, according to the Maryland Natural Resources Police. The boat was a 1988 Wellcraft 32-foot cruiser, police said.

Police said the explosion happened immediately after the vessel fueled up at Schaefers Canal House and Marina.

Four people suffered serious burns and were flown to Johns Hopkins Bayview Medical Center. Five others were transported by emergency service vehicles to be treated, and another person was evaluated for injuries at the scene.

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Maryland’s Natural Resources Police and the Office of the State Fire Marshal are investigating.

On Friday, two adults and two children were hospitalized after their boat caught fire in the Patapsco River. All were in stable condition, fire officials said.