Police are looking for a gunman who chased a female clerk though a store in Portland. The incident, a portion of which was caught on the store’s surveillance video, happened early Wednesday night at Tebb’s Smoke shop. Police said the masked man, holding a handgun, chased the clerk through the store before she was able get out of the building. The woman, who was alone in the store at the time of the incident, was not physically harmed. Police said the gunman left the area on foot and has not been captured. He was wearing a dark hooded sweatshirt and carrying a gray backpack. Investigators aren’t sure if the man was intending to rob the store or commit another violent crime.