A 13-year-old boy was seriously injured on Saturday after his mother accidentally shot him during a fight outside an Arizona home, police said.

Phoenix police said the shooting unfolded in the backyard of a home on East Taylor Street around 5:20 p.m. on Saturday.

They said the 13-year-old was in the backyard when a man named Michael Wilson, 59, confronted an unwanted guest outside, which led to a fight.

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Police said the teen’s mother, Tonya Monroe, 41, went to get a gun from their home to break up the fight and accidentally fired it, striking her son.

The 13-year-old was taken to a nearby hospital with serious injuries. Doctors later listed him in stable condition, according to police.

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Police arrested both Wilson and Monroe. The teen’s mother faced several charges including aggravated assault and disorderly conduct involving a weapon.

Wilson was accused of drug and weapons possession. The unwanted guest, who did not report any injuries, did not cooperate with investigators, police said.

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Investigators said they developed probable cause to arrest Monroe and Wilson based on interviews and evidence found inside the home.

The investigation was ongoing.