NEW YORK - Days after destroying the personal and professional life of a Lexington, Kentucky, newscaster who bullied him on-air by asking why he was invited to speak at Friends star Jennifer Aniston's recent wedding, King of All Media Howard Stern has issued an aggressive warning to his co-judges on NBC's America's Got Talent. "I'm telling you right now: Do not put me in your Periscope videos," Stern said Monday morning in a statement aimed at co-host Howie Mandel. "That phone will be up your a-- if you use that thing around me." Stern is no stranger to physical violence. As an adolescent in Roosevelt, New York, he was beaten daily with chains by African Americans integrating into his native Long Island neighborhood. When the new black residents began stealing his pants as well, his family was forced to flee to the largely white, upper-class community of Rockville Centre. "His rationale is that because he's backstage at AGT, he thinks he can film behind the scenes and be interesting," Stern continued, growing angrier. "But it's not fair if he wants to include other people," Stern said, referring to members of his personal security team who guard the outside of his dressing room, and to his personal stylist and on-call hairdresser who hover around him at all times. "I'm not kidding when I say I'm going to shove that phone up Howie's a-- if he uses it again," the 61-year-old declared, dismissively brushing aside a summer scarf decorated in human skulls. Mandel has not responded to interview requests at this time, but is presumably taking his co-judge's threats of violence very seriously. Stern holds a brown belt in Japanese Shotokan karate, after all, and has routinely demonstrated some of his lethal techniques onstage at AGT auditions. "The other judges see Howard's physicality, and they become extremely intimidated by him," an anonymous source who works at AGT confides. Stern is licensed to carry a concealed firearm in New York City -- a fact that has supermodel co-judge Heidi Klum "walking on eggshells" around him, the source adds. "When Heidi joined the show, she loved to sing, and it would drive me nuts," Stern told listeners to his Sirius XM radio program. "I'm sitting there trying to think about my job, and she's singing to me. I've asked her to stop, but she's trying to be funny." Stern paused, letting a chilling silence settle in. "So I told her that if I start trying to be funny ... it's going to hurt." A source at Sirius XM says that Stern then motioned to the handgun he keeps hidden on his person. Rumors inside the AGT camp suggest that co-judge Mel B has become inconsolably frightened that she'll say or do something that will accidentally offend the extremely volatile Stern. The DJ has made it clear that the therapist who has conducted intense psychoanalysis on him for up to four days a week for the past 15 years is currently on vacation, and that he is ready to snap. "I'm even afraid I'll drink my coffee the wrong way. You never know what will set that man off," Mel B was overheard saying between sobs in her dressing room. Stern has said repeatedly that he is leaving AGT this season by choice and not by force. The remaining judges are said to be relieved. But for Howard's replacement, it's another story. "Simon [Cowell] has heard the physical threats Mr. Stern has been issuing, he's familiar with Mr. Stern's violent past, and he has personally witnessed Mr. Stern bench press 95 pounds, counting the bar," a source at NBC whispers. "After the Sony hacks, when Mr. Stern found out about Simon taking his job away from him ... Simon became a ghost. He couldn't eat, he couldn't sleep ... He's constantly looking over his shoulder, worried that Mr. Stern is going to get physical." Stern has alluded in the past to his clandestine methods of ruining the lives of people who cross him -- which has his replacement judge even more paranoid, the source says. "Frankly, Simon isn't sure he wants to be involved in AGT anymore. He has a family to think about."