An electrical outage has left some 10,000 DTE Energy customers in west Detroit in the dark the day before Thanksgiving.

Crews were headed to the scene shortly after the incident was reported about 9 p.m. and "will work quickly and safely to restore everyone's power," said Cynthia Hecht, a senior communications specialist with the utility.

The company did not yet know what sparked the outage, she said.

Its online outage map showed large clusters stretching between Outer Drive and Plymouth Road.

The area included Sinai-Grace Hospital, where the outage apparently caused a fire alarm to malfunction, sparking the city fire department to respond, Deputy Fire Commissioner David Fornell said. 

The facility was on a generator, but some rooms appeared to be in the dark, said Rhoda Henderson, whose 84-year-old father remained hospitalized after a heart procedure earlier Wednesday.

Staffers were working as best they could, she said, but "it’s frightening after a surgical procedure."

A representative for the Detroit Medical Center, which oversees the hospital, said in a statement: "All appropriate protocols are in place and our patient safety is our number one priority."

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