March 24 (UPI) -- Authorities in Washington, D.C., are hunting for at least two suspects after a U.S. Park Police officer was shot while on undercover duty in the nation's capital.

The shooting occurred at about 7:30 p.m. EDT Monday near the 5000 block of Queens Stroll Place SE and the 4600 block of Hillside Road SE, the Metropolitan Police Department said in a statement.

U.S. Park Police Deputy Chief Scott Bretch told reporters in a press conference that the officer was riding in an unmarked police car as part of an ongoing U.S. Park Police investigation when the office was "ambushed" by at least two gunmen.

The officer was struck by gunfire, he said. Authorities said police did not return fire.

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