US Marshals, Flagstaff Fire Department, and Guardian medical responded to a serious fall injury at the Flagstaff US Marshals Office (123 N. San Francisco St) this afternoon around 1 p.m. Witnesses reported the teenage victim possibly jumped from the 3rd floor balcony and landed on the concrete floor inside the building. The victim was transported to Flagstaff Trauma center in critical condition. Due to the nature of this incident, further details are not available at this time.