If the situation permits, try to ask the following questions:
If there is a threat made to an employee, try to find out the exact nature of the threat and reason for the threat.
If the call is a bomb threat, remember that almost all such calls are hoaxes or pranks. However, all threatening calls must be treated seriously and handled quickly. Get as much information as possible and try to find out:
When is the bomb going to explode?
Where is the bomb now?
What kind of bomb is it and what does it look like?
Why did you place the bomb?
Person receiving the bomb threat should try to keep the caller on the line. Delay the caller with statements like: "I'm sorry, I didn't understand you. What did you say?"
Try to listen to the caller's voice for identification.