at the WTC even though many experts said that the WTC was a target (it had been bombed previously to 9/11)

"Since 1999, New York City’s Office of Emergency Management, charged with coordinating all aspects of the response, had occupied permanent headquarters in Seven World Trade Center, on Greenwich Street, just north of the landmark twin towers. A vital communications link was the radio repeater system based on the ground floor of One World Trade Center, the north tower. The loss of those facilities – and key personnel working there – significantly hampered the response."

http://theconversation.com/disaster-communications-lessons-from-9-11-65142