A player on the South Oak Cliff High School football team was arrested for a shooting hours after winning a state championship.

Xavier Mayfield is in the Dallas County Jail on a charge of aggravated assault, jail records show.

The Dallas Police Department said officers were called to a reported shooting on Knoll Ridge Drive in the southwestern corner of the city at about 9:30 p.m. on Saturday. Officers found a male had been shot in the neck with a rifle.

Officers asked 18-year-old Mayfield if he shot the victim; Mayfield said he had.

Mayfield reportedly told officers that he was in the bathroom on the second floor getting ready to go to his room just before the shooting. He said the victim called his name, and when he turned around, "a single gun shot went off from the ARIS ABC Rifle" that he was holding.

Mayfield told police that he wanted to take the victim to the hospital for treatment, and so brought the victim downstairs and called 911 when they got to the front door.

The victim was taken to a hospital for their injuries and was stable, police said, and Mayfield was arrested.

One witness in the house told police they saw Mayfield swinging the rifle used in the shooting and that Mayfield said the safety was on.

The Next Generation Action Network, a civil rights organization based in South Dallas, released a statement on Monday saying the shooting was accidental and the victim was a teammate.

Dallas police have not yet responded to those claims or additional questions about the incident from CBS News Texas.

This is a developing story and will be updated.