The Pottawattamie County Sheriff’s Office reports a Nebraska man was arrested Tuesday night on weapon and Theft charges, following a report of an armed subject at the Riverside High School. Dispatch had advised that a black male came to the car door of the person reporting the incident, and told him he was taking his vehicle. The suspect was last seen walking up toward the school and had a gun in the center of his waistband. The subject also allegedly tried to steal another car, and was seen walking in front of the school, and subsequently in the smaller parking lot. It was noted that he never actually pulled the gun out, but showed the butt of the weapon. Upon arrival, deputies located 18-year old Puom Gatluak Gach, of Bellevue, NE., in a stolen vehicle. Gach was taken into custody without incident and brought to the Pott. County Jail, where he was charged with Robbery in the 1st Degree – Armed with a dangerous weapon, and Theft in the 2nd Degree – Motor vehicle theft under $10,000. He was being held on $25,000 bond for the Robbery charge, and $5,000 bond for the Theft charge.