COLLEGE PARK, Md. (AP) — Authorities appealed for patience from two college communities reacting in shock, fear and anger after a white University of Maryland student was arrested in what police called the unprovoked stabbing of a black Bowie State University student. Police and the FBI said they are investigating the killing of Richard Collins III as a possible hate crime, because the suspect, Sean Urbanski, became a member of a racist Facebook group several months ago. Defense attorney William C.