Maurice Mobley (Jacksonville, Fla., Sheriff’s Office)

Police have arrested 34-year-old Maurice Antonio Mobley in connection with the fatal accidental shooting of a 5-year-old girl over the weekend, Action News Jax reports.

Mobley is facing charges of possession of a firearm by a convicted felon, the Jacksonville, Fla., Sheriff’s Office confirmed. He is the boyfriend of the mother of 5-year-old Serenity Allen, who was accidentally shot by her 8-year-old brother. A 4-year-old neighbor was also hurt in the incident.

According to an earlier report by Action News Jax, the three children were home alone when the 8-year-old found a gun inside the apartment and accidentally fired it, hitting his sister and the neighbor. The 4-year-old boy’s injuries were not life-threatening, police said.

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After the shooting, the 8-year-old and the 4-year-old ran to a neighbor for help.

Mobley voluntarily turned himself in Sunday. The sheriff’s office believes that he is the one who brought the gun into the home. The sheriff’s office will continue meeting with the state attorney’s office, the Florida Department of Children and Families, the child-protection team and the medical examiner’s office to determine if any additional charges or sanctions are warranted.

Read more at Action News Jax here and here.