The video shows Listi kneeling before he approaches the altar and tells the pastor, who has his hands raised in prayer, what has happened.

“I’d like everybody to be seated for just a moment,” the priest says. As he does, people are seen milling about, and the crowd’s din gets louder.

Twenty seconds later, he implores the attendees: “I would like everyone to join me in prayer.”

He begins the Hail Mary.

“Hail Mary, full of grace. The Lord is with thee,” he says, as the sounds of children screaming echo in the sanctuary. About 40 seconds later, a police officer enters the frame at the front of the church.

About two minutes later, though it is unclear why, the scene grows chaotic, with screaming and people looking frantically about. The pastor and a deacon kneel behind the altar. Behind them stands an officer with his gun out of its holster. About 30 seconds later, altar servers run behind the kneeling men.

About a minute and a half later, someone’s voice comes over the microphone: “Listen, guys, just get a hold of your child. Go slowly. We did apprehend a young man. He is in custody. He is in the police custody. Calm down and just get next to your child and go slowly.”

The church posted online that it would have uniformed officers at upcoming Masses. “We invite First Communicants to receive First Holy Communion at whichever Mass they choose to attend this weekend,” church leaders wrote. “We are grateful for all the prayers for our St. Mary Magdalen community.”

Abbeville Mayor Roslyn White posted Saturday on Facebook that she was grateful for the “brave, diligent individuals who kept our community safe under threat and the officers who remained focused under unimaginably stressful circumstances.”