In Providence, Rhode Island, police released this surveillance footage showing a person of interest face covered by a mask, walking in the area of Brown University two hours before a gunman opened fire on a group of students preparing for finals, killing two and wounding nine. He rounded this street corner and walked down that way. Over there, you can see the building where the shooting took place.This area is surrounded by cameras, but it's unclear where he went next. The man's identity unknown. The FBI is ...