A Fryeburg woman and her son were arrested Saturday night in connection with a domestic violence case involving a third person, police said.

Police Chief Joshua Potvin said in a news release that his officers went to a home on Lovewell Pond Road in Fryeburg around 7:30 p.m. and arrested Catherine Heinz, 55, on a charge of violating the conditions of her release. She had allegedly been involved in a domestic violence assault at that address on Thursday.

While officers were transporting her to jail, Heinz’s son, 22-year-old Mark Foster, got into an altercation with the domestic violence victim, Potvin said.

The 59-year-old male victim displayed a 9 mm handgun during the altercation, the chief said. During the scuffle, the victim accidentally discharged the gun into the floor of the home.

Foster disarmed the victim and then repeatedly hit him with his gun, Potvin said. Foster then fled the residence with the victim’s handgun before he was apprehended by police in the parking lot of the Rite Aid Plaza on Bridgton Road.

Foster was charged with robbery, possession of a firearm by a prohibited person, aggravated assault, violation of a protection order, and violation of conditions of release. Heinz and her son are being held at the Oxford County Jail.

The victim was treated for his injuries by a crew from Fryeburg Rescue.