Edward “Robbie” Robinson, a 2015 DeMatha graduate and All-Met honorable mention was arrested Friday night in Tempe, Ariz., after posting threats to shoot people at Arizona State’s athletic facilities on Twitter.

Robinson, in more than 100 tweets posted to his account, @RobThaProphet, Friday, said just after 1:30 p.m. Mountain time that he was attempting to purchase a gun to “spray the stadium.” Arizona State released an emergency alert about the threats at the Tempe campus.

Robinson, 20, was arrested off-campus around 8 p.m. Mountain time on felony charges of knowingly interfering with an educational institution, marijuana possession and drug paraphernalia possession, per online court records via Maricopa County Superior Court. Each charge carries a maximum two-year prison sentence.

He is being held at the 4th Avenue Jail in Maricopa County, Ariz., on $50,000 bond. His next court appearance is March 2.