A woman in Joliet suffered an apparent graze wound in a shooting Thursday from which officers recovered more than 20 spent shell casings.

About 9:30 p.m., officers responded to the incident and learned that a 51-year-old woman had been struck by gunfire at a residence in the 700 block of Second Avenue, according to Joliet police.

“The motive for this shooting remains under investigation,” Joliet Police Sgt. Dwayne English said.

The woman suffered an apparent graze wound to the abdomen in a shooting that occurred outside the residence, English said.

The woman was in the living room of the residence at the time, he said.

The woman’s injury is not considered life-threatening, English said.

Officers searched the area and found more than 30 spent shell casings outside the residence, which had been struck by numerous rounds of gunfire, English said.

Officers also determined that an occupied residence in the 100 block of Hobbs Avenue had been struck by gunfire, English said.

No injuries were reported at that location, he said.