Ok hier was die FEMA sagt:
Ist klar das der Anrufer alle Informationen angibt und auch richtig...
"

Bomb Threat

If you receive a telephoned bomb threat, you should do the following:

• Get as much information from the caller as possible. Try to ask the following questions:
  
  
  1. When is the bomb going to explode?
  2. Where is it right now?
  3. What does it look like?
  4. What kind of bomb is it?
  5. What will cause it to explode?
  6. Did you place the bomb?
  7. Why?
  8. What is your address?
  9. What is your name?
  
  
• Keep the caller on the line and record everything that is said.
  
  
• Notify the police and building management.

"
http://www.fema.gov/hazard/terrorism/exp/exp_threat.shtm