A teenager is accused of threatening to shoot a security guard at Central Valley High School. Deputies were called to the campus at 10 O’clock Thursday morning. The 16-year-old boy is a former student at the school. He was removed last year for violent behavior. It’s not known why he showed up Thursday, but when he got there a security guard recognized him and told him he had to leave. He did as requested but on his way out he told the security guard that he would come back and shoot him. Deputies found the boy at his home off Montana Avenue and he was arrested and booked into juvenile hall. No weapon was found.