Lights in many buildings in downtown Detroit remained off Sunday as a result of a power outage. Workers with the Detroit Public Lighting Department were working with DTE Energy to restore electricity.

A spokesman for Detroit Mayor Dave Bing, Dan Lijana, said the outage was reported around 7:30 a.m. Saturday.

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First estimates said power would be restored by Saturday night, however lights and traffic signals were not working as of 10 a.m. Sunday.

The outage has affected the Coleman A. Young Municipal Center, Cobo Center, and Wayne County Community College’s downtown campus.

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Power came back on at Cobo Center Sunday. Detroit Receiving Hospital, which closed its emergency room Saturday, had full power Sunday.

The Detroit Institute of Arts was closed Sunday. The People Mover also was shutdown.

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The outage is blamed on a piece of equipment that overheated.