An off-duty D.C. police officer and his brother-in-law were shot and wounded early Monday after leaving a strip club in Dearborn, Mich., near Detroit, according to law enforcement authorities.

Dearborn Police Lt. Ronald Beggs, who is with the investigative unit, said the 32-year-old officer was struck in his upper body and is expected to survive. His brother-in-law, who is 34, suffered a graze wound. No arrests have been made.

Police said the shooting occurred about 2:15 a.m. a few blocks from The Pantheion Club, an adult entertainment bar on Michigan Avenue. Beggs said the victims had just left the club and were in a white sport utility vehicle stopped at a red light when another car pulled up beside them in a four-door sedan.

Both vehicles had their windows up. Beggs said the passenger in the sedan lowered his window and yelled something. “The driver of that vehicle leaned over and fired several shots,” he said. The brother-in-law, who was driving, was grazed; the officer was struck once, Beggs said.

The lieutenant said the number of shots and type of weapon have not been determined. Video of the white SUV shows at least five bullet holes in the side and a shattered driver’s side window. After the shooting, the driver of the SUV went got on Interstate 94 and sped to the 9th police precinct, about 15 miles away.

Beggs said he did not know if the off-duty officer, whom police declined to name, was armed. He also said a motive has not yet been determined, and that detectives do not know what the passenger in the sedan yelled. He said police plan to interview the officer at the hospital later Monday morning. Beggs also said police do not know if the men in the sedan were also in the club.

A D.C. police spokeswoman declined to comment.