On July 20, 2019 at approximately 4:00 AM West Chester Police officers were dispatched to an apartment in the 600 block of S Walnut Street for the report of a subject threatening others with a knife. Officers identified Dean Harley, W/M/21 YOA of Newtown, PA as the subject who allegedly threatened them with a knife. A verbal argument escalated into a physical altercation . Harley is alleged to have kicked in a door and threaten several people with a knife. Officers located a knife at the scene. Harley was arrested and charged with Aggravated Assault, Possessing Instruments of Crime and related charges. He was arraigned before a Magistrate.