DETROIT -

An off-duty U.S. Customs and Border Patrol officer was shot Monday morning on Detroit's west side.

Sources told Local 4 witnesses heard about 12 shots just before 7 a.m. in the neighborhood off Greenview near Fenkell.

They said the officer saw a couple of men pushing what he believed to be a stolen SUV up the driveway of a vacant house across the street from his home.

Watch uncut: Off-duty Border Patrol agent shot in Detroit

When he asked the men what they were doing, they opened fire. The officer returned fire, but he was shot in the forearm.

Neighbor John Moore said he rushed to help the officer.

"He had put a tourniquet to stop the bleeding. So, I guess it [the bullet] went right through his joint there. He still had movement in his arm," Moore said.

Moore said the officer was alert and seemed to be doing OK.

Charlene Woodley and her husband own the SUV and live just five blocks away from the shooting scene.

"My husband was headed out to take me to the doctor and the car was gone," Woodley said.

The U.S. Customs and Border Protection officials released the following statement about the incident:

"An off-duty U.S. Customs and Border Protection officer was involved in a shooting in Detroit early this morning. Local emergency personnel responded and transported the officer, who had been shot, to a local hospital for treatment. The officer's injuries are not life-threatening. The Detroit Police Department is the lead agency investigating the incident."