ATLANTA – On Tuesday, federal prosecutors filed charges against a Georgia man, arrested the previous day, following a tip-off from his family about his alleged plans for a shooting at Atlanta’s international airport.

Prosecutors revealed that Billy Joe Cagle, aged 49, made a menacing threat during a FaceTime call while driving. He reportedly declared his intention to attack the world’s busiest airport, ending the call with the words, “I’m at the airport, and I’m gonna go rat-a-tat-tat.”

Cagle, a resident of Cartersville, was apprehended by Atlanta police on Monday at Hartsfield-Jackson Atlanta International Airport. Officers discovered an assault rifle and ammunition in his truck parked outside, according to Chief Darin Schierbaum.

On Tuesday, federal authorities announced that Cagle faces charges of attempting violence at an international airport, making interstate threats, and possessing a firearm as a felon.

The alert from Cagle’s family prompted Cartersville police to notify Atlanta authorities, who located and detained Cagle at the airport within just 15 minutes, Schierbaum noted. The airport lies approximately 50 miles southeast of Cartersville in northwest Georgia.

“Cagle senselessly threatened to inflict horrific violence on innocent travelers at the world’s busiest airport, wielding a high-powered weapon he was legally barred from possessing,” stated U.S. Attorney Theodore Hertzberg in a press release.

Online jail records showed that Cagle was being held in the Clayton County Jail on state charges of possession of a firearm by a felon and terroristic threats. Schierbaum said Tuesday that he would be transferred to federal custody.

It was not immediately clear whether the man had a lawyer who could comment on his charges and attempts to reach his family were unsuccessful.

Sgt. T. Jones, who has about six months left in her three-decade career with the Atlanta Police Department, was on the phone with one of Cagle’s family members Monday morning, relaying information to officers to help them identify him. She and other officers spoke about the arrest during a news conference Tuesday.

“This is what I’ve trained to do and I’ve loved doing this for the past 29 years and it’s just an amazing feeling,” she said of helping to avert a potential tragedy.

Officer M. Banks, who has been with the Atlanta Police Department for nearly three years and at the airport for about two years, identified and arrested Cagle.

“I was scared. It was fearful for a second,” she said of the moment she approached him, adding that her training kicked in, but that she was fully aware of how easily things can go wrong.

Nick Roberts, who has known Cagle since high school, texted his friend Sunday night after being concerned by Facebook posts he had made. He said Cagle was struggling with mental health issues. Cagle had posted on Facebook earlier Sunday that he is schizophrenic and was taking medication.

Roberts said Cagle called him at about 9 p.m. Sunday night and assured him he was OK. Roberts said Cagle loved his two daughters and worked hard hauling hay and doing fencing work.

“I want folks to know that he wasn’t some monster,” Roberts said. “This was a very big surprise for a lot of us that went to high school with him and know him in the community.”

During a news conference Monday, police showed surveillance video that they said showed Cagle arriving at the airport and body-camera video of his arrest.

A Chevrolet flatbed pickup truck is seen arriving curbside at the airport terminal around 9:30 a.m. and then a man police identified as Cagle is seen entering the airport a few minutes later. He walks over to the TSA security checkpoint and had “high interest in that area,” Schierbaum said.

Body-camera footage shows Atlanta police officers, who had a photo of Cagle provided by his family on their phones, approach him and begin asking him questions before taking him into custody. As they take him to the ground and put handcuffs on him, Cagle can be heard yelling.

___

Associated Press reporter Hallie Golden in Seattle contributed to this report.