Police said they arrested a man with an AR-15 and ammunition who threatened to carry out a shooting at Hartsfield-Jackson Atlanta International Airport.

On Monday, police announced they had arrested Billy Cagle, 49, after a tip from his family that he threatened to go to the world’s busiest airport and “shoot it up.” Cagle was arrested at the airport, where police discovered an AR-15 and 27 rounds of ammunition in his truck.