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A freighter ran aground Monday evening near the free bridge connecting Grosse Ile and Trenton — briefly delaying traffic, officials said.

The vessel was bound for the DTE Energy Co. plant in Trenton when it ran aground just north of the bridge, said Gabriel Settel, assistant public affairs officer for the U.S. Coast Guard Sector Detroit.

Traffic was delayed about 30 minutes while the bridge was temporarily closed, he said.

A tug boat freed the freighter, which was carrying coal from Toledo, by 9:30 p.m., according to Grosse Ile police and the Coast Guard.

The Coast Guard’s waterways division was investigating what caused the incident, Settel said, adding the freighter did not appear to have mechanical issues.

Those vessels typically carry between 10,000 and 15,000 tons of coal, said Randi Berris, a spokeswoman for DTE.

After an inspection, the freighter was expected to have its coal unloaded overnight, she said.

The incident was not expected to affect operations or the supply at the Trenton plant, Berris said.

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