(CNN) 鈥 Authorities arrested a man inside Hartsfield-Jackson Atlanta International Airport on Monday after his family alerted police that he was armed and headed to the airport to 鈥渟hoot it up.鈥
The man, Billy Joe Cagle, was not armed when he was arrested but police found an 鈥淎R-15 assault rifle鈥 in his vehicle parked outside, authorities said.
He is facing charges of terroristic threats, criminal attempt to commit aggravated assaults, possession of firearm in the commission of a felony and possession of a firearm by convicted felon, according to Atlanta Police Chief Darin Schierbaum, who called it a 鈥渢ragedy averted.鈥
It is unclear whether Cagle, who lives in Cartersville, about an hour north of Atlanta, has an attorney. He was convicted of marijuana possession more than two decades ago, to a Georgia Department of Corrections search.
CNN has reached out to the Transportation Security Administration and the Hartsfield-Jackson Atlanta International Airport for comment.
The FBI said assisting in the investigation.
鈥淭his individual did have a semi-automatic weapon, and this individual was mentally challenged. And when you have those combinations together, it can turn out to be deadly,鈥 Atlanta Mayor Andre Dickens said at a news conference Monday.
Cagle鈥檚 family had alerted Cartersville police he was armed and he had said in a livestream on social media he was on his way to the airport, Schierbaum said. Cartersville police then notified the Atlanta Police Department.
But what authorities did not know, according to Schierbaum, is Cagle was already at the airport, having arrived shortly before 9:30 a.m. at its south terminal. 鈥淗e seemed to be very interested in the TSA check-in area, which you can see was heavily, heavily crowded,鈥 the chief said, referring to surveillance camera images.
Atlanta鈥檚 Hartsfield-Jackson International Airport is the busiest airport in the world, . This year, it celebrated its centennial milestone. Atlanta is headquarters to major US operator Delta Air Lines.
鈥淲e鈥檙e here today briefing you on a success and not a tragedy, because a family saw something and said something,鈥 Schierbaum said.
Homeland Security Secretary Kristi Noem in a post on X she鈥檚 鈥渢hankful this individual was taken into custody by law enforcement before harming anyone.鈥
CNN鈥檚 Alexandra Skores contributed to this report.
This story has been updated with additional information.
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