HOUSTON --Police have charged a teenager for allegedly carrying a loaded gun into his high school. Miguel Arevalo, 17, is charged with carrying a prohibited weapon in a prohibited place. Katy ISD police arrested the teen Tuesday at Katy Mayde Creek High School. Arevalo allegedly brought a loaded weapon to school and showed it off to students in a restroom. Another student told authorities who found the student and confiscated the weapon. The district sent a letter home to parents on Tuesday. Arevalo posted a $5,000 bond and is expected to make his next court appearance on May 9.