Mt. Juliet, Tenn. – Armed teens carjacked an adult man overnight at Exxon after their other stolen car broke down nearby. Around 2:30 a.m. this morning, a 39-year-old man was approached by three teenagers while he was pumping gas at Exxon, at 125 N. Mt. Juliet Road. One of the teens pressed a handgun on the victim’s head during the robbery. The teens stole his wallet and 2014 Gray Kia Sportage, fleeing towards Nashville on Interstate 40. The victim’s credit card was used around an hour later at a market in Smyrna, where the teens bought snacks.