Providence police released new video of a “person of interest” tied to the Brown University mass shooting Monday evening as officials attempted to calm growing anxiety that the gunman is still on the loose. The series of new videos is the most revealing images of the man police are pursuing, showing him dressed in dark clothing with a black face mask hiding most of his mug. One of the clips shows him milling outside near campus a few hours before the shooting, while other images show a side profile of the possible shooter walking on a sidew