thanks to an effective disaster recovery plan, Nasdaq was up and running 6 days after the September 11, 2001 terrorist attack that destroyed the twin towers of the World Trade Center. Nasdaq's headquarters was located on the 49th and 50th floors of One Liberty Plaza, just across the street from the World Trade Center. When the first plane hit, Nasdaq's security guards immediately evacuated personnel from the building. Most of the employees were out of the building by the time the second plane crashed into the other tower. Although employees were evacuated from the headquarters and the office in Times Square had temporarily lost telephone service, Nasdaq was able to relocate to a backup center at the Marriott Marquis. Once there, Nasdaq executives went through their list of priorities: first, their employees; next, the physical damage; and lastly, the trading industry situation.