Sex offender found on school bus with elementary students returning from field trip 03/18/2019 12:43 pm PDT Comments WGHP / Ramsey County via WGHP: ST. PAUL, Minn. (WGHP) -- A registered sex offender was found in a school bus with elementary students returning from a field trip. WCCO reported that Michael Charles Friedrichs, 61, was arrested late last month in St. Paul, Minn. for a sex offender registration violation. Officers were called to Chelsea Heights Elementary School at about 1 p.m. Feb. 28 for a report of an unauthorized man on a school bus. Friedrichs said he was at the Walker Art Center and boarded the wrong bus. He was booked into jail but has since been released. Friedrichs' previous crimes include exposing himself to children and sexually engaging with two teenage boys, according to WCCO. MORE: Sex offender found on school bus with elementary students returning from field trip - WGHP #Minneapolis #Minnesota #SexOffender #WGHP Waiting for your permission to load facebook comments.