Morrow police arrested 45-year-old William C. Caldwell III, who was being held without bond Thursday in the Clayton County jail. He was not part of the mall's Christmas staff.
Police say Caldwell got in line Wednesday evening to have his picture taken with Santa Claus.
Police say when Caldwell reached the front of the line, he told Santa he had dynamite in his bag. Santa called mall security and Caldwell was arrested.
Caldwell faces several charges, including having hoax devices and making terroristic threats.