An unidentified woman was killed Sunday when the car she was driving struck a tree in Prince George’s County, police said.

       The accident occurred about 7 a.m. at Martin Luther King Jr. Highway and Whitfield Chapel Road, just east of the Capital Beltway, in the county’s Ardmore area, police said. They said the woman had been traveling west on Martin Luther King Jr. Highway, or Route 704.

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       “For reasons that remain under investigation, the car left the roadway and crashed into a tree,” police said in a statement. “The driver was pronounced dead at the scene.”