May 18, 2009 5:18 pm School Community Mourns Fallen Leader As the IS 238 community mourns Assistant Principal Mitchell Wiener, school officials are trying to keep track of which students and staff members are ill. 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