(OAK PARK) An off-duty Oak Park Police officer was shot early Sunday during a robbery on Chicago’s Far South Side.

About 5:13 a.m., the 57-year-old officer was getting out of his own vehicle in the 300 block of West 103rd Street when two males approached him, according to Chicago Police. One of them opened fire and struck him in the arm and leg.

The officer returned fire and shot one of the two, police said.

The two males were trying to rob the off-duty officer, according to a statement from Oak Park police.

After the shooting, the two males fled. The officer — a 25-year veteran of the Oak Park Police Department — was taken to Advocate Christ Medical Center in Oak Lawn, according to Chicago and Oak Park police. He was listed in serious condition.

A few minutes after the shooting, Chicago police officers found two “males of interest” about half a mile away in the 9900 block of South Princeton. One of the two had a recent gunshot wound. He was taken to Christ Medical Center in serious condition, police said.

No charges had been filed as of Sunday evening, according to Chicago Police.

“Our immediate concern is for the well-being of our officer and his recovery from the injuries sustained while he protected himself,” Oak Park Police Chief Rick Tanksley said in a statement.