A man was arrested Monday morning at Hartsfield-Jackson Atlanta International Airport after allegedly threatening to carry out a mass shooting, and police say his family was key to his capture.

Billy Joe Cagle, 49, is charged with possession of a firearm by a felon, criminal attempt to commit aggravated assault, and making terroristic threats. Authorities discovered a semi-automatic weapon and 27 rounds of ammunition in his truck after his arrest.

Police said Cagle walked through the doors of the South Terminal of the airport at around 9:30 a.m. on Monday.

They believe he was headed towards a TSA checkpoint. Law enforcement said it was the quick thinking of the suspect’s family and the actions of the officers that saved lives. Surveillance cameras show him walking inside and looking aro

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