New York City Office of Emergency Management was the agency responsible for coordination of the City's response to the attacks. Headed by then-Director Richard Sheirer, the agency was forced to vacate its headquarters, located in 7 World Trade Center, within hours of the attack. The building later collapsed. OEM reestablished operations temporarily at the police academy, where Mayor Giuliani gave many press conferences throughout the afternoon and evening of September 11. By Friday, rescue and reliefs were organized and administered from Pier 92 on the Hudson River.