October 22, 2008 9:00 am Cops Gunned Down in Subway Struggle The NYPD is trying to figure out what triggered a subway gun battle that left two police officers and a suspect wounded. Local 29:11 NYPD moves in on protesters at Columbia University making dozens of arrests 1:45 NYPD enters Columbia University in riot gear to clear protest 3:24 Mayor Adams and the NYPD urge protesters to leave Columbia University 18:33 NYC Mayor Eric Adams says Columbia University protesters include outside actors 15:40 Aerial views of Hamilton Hall at Columbia University