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Duke Energy crews are working to restore power to thousands of central Indiana residents who lost power amid dangerously cold temperatures .
About 4,000 Duke Energy customers were without power Wednesday morning on Indianapolis' north side and adjacent areas of Hamilton County. About another 200 outages remained near Kokomo, about 40 miles north of Indianapolis.
The utility is investigating the cause of the outages, which came during the coldest temperatures in years over much of the Midwest.
The National Weather Service says the temperature fell to minus 11 degrees (negative 23 degrees Celsius) shortly after sunrise Wednesday in Indianapolis, tying the record low for the date set in 1966.
The U.S. Postal Service said it would suspend mail delivery on Wednesday in parts or all of several Midwest states, including Indiana.
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