One of the most difficult emergency decisions to be made involves the evacuation of a building because of a bomb threat, especially because statistics show that over 95 percent of such threats are…

One of the most difficult emergency decisions to be made involves the evacuation of a building because of a bomb threat, especially because statistics show that over 95 percent of such threats are hoaxes. Suppose your firm's switchboard operator receives such a threat, wherein the caller identifies himself as a member of a recognized terrorist group and gives the location of the bomb as to floor as well as the time of detonation. Which of the following actions should receive priority as to evacuation?