A 19-year-old Sedona man was arrested last week after having a gun in the parking lot of Sedona Red Rock Junior-Senior High School, potentially to intimidate a student. Police say the incident happened last Thursday after Thomas Zielinski was issued a no trespassing order earlier in the day. He was arrested following a lockdown at the school. Zielinski was arrested and booked into the Yavapai County Detention Center in Camp Verde on charges of possessing a deadly weapon on school grounds, reckless handling of a firearm and misconduct involving weapons. School officials sent an email to parents about the situation, updating them on the incident on Sunday.