Butler police are investigating a shooting this evening in the 300 block of Wagner Avenue.

A woman was reportedly hit in the back of the head, possibly by bullet fragments or shattered glass, but she was not seriously injured in the shooting shortly after 5:30 p.m., authorities said.

It was not known if police have made any arrests or if they have identified the shooter.

Butler police Capt. David Dalcamo is leading the investigation and was conducting interviews at the station. He was not immediately available for comment.

Neighbors reported hearing an initial series of shots, maybe two or three, followed by a second volley of as many as six shots.

Investigators confirmed that between eight and nine rounds were fired. Some of the shots struck the apparently targeted house.

At least one round hit a house next door.

The target house at the time was occupied by two or three adults and a child, neighbors said.

State police and their forensic services unit assisted city police process the crime scene, including gathering evidence. Numerous shelling casings were recovered, police said.

A man staying at a house next door recalled looking out his window and seeing the shooter, pistol in hand.

“I saw the guy raise the gun and start shooting,” the man said. “He shot first at the front of the house and then walked around it, shooting.”

According to the witness, the shooter said nothing from the time he opened fire until the time he walked away, from the back of the house.

Other neighbors said they heard people arguing and yelling moments before the shots started.