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WASHINGTON (AP) - Embattled District of Columbia Mayor Vincent Gray and his challengers are awaiting results, more than an hour after polls closed amid light turnout in the city's Democratic primary.

Gray is seeking a second term amid a federal investigation of his 2010 campaign. The Democratic primary has historically decided the mayoral election in the district.

Polls have shown Gray neck-and-neck with his top challenger, D.C. Councilmember Muriel Bowser. She says the city needs a fresh start as the mayor faces possible criminal charges.

Federal prosecutors say Gray knew about an illegal slush fund that helped him defeat Adrian Fenty four years ago, and five people involved with his campaign have pleaded guilty. Gray says he did nothing wrong, and he hasn't been charged with a crime.

The D.C. Board of Elections says turnout was lighter than expected.

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