What action should be taken if a bomb threat is clearly a hoax?

In the scenario of a bomb threat that is determined to be a hoax, reporting the call immediately to the local police for investigation is the most prudent action. This approach ensures that law enforcement is informed and can assess the situation appropriately. Even if the threat appears to be a hoax, the police are equipped to handle such incidents, as they may involve further implications for safety and security.

Taking this action also helps to prevent complacency in dealing with threats, as responding to all bomb threats, regardless of their perceived credibility, is crucial to maintaining a proactive security posture. Immediate reporting can lead to the investigation of those making false threats, which is important for deterring future occurrences.

Other options like doing nothing or waiting to confirm the hoax do not address the potential legal implications and public safety risks involved in handling bomb threats. Notifying the Secret Service would typically not be necessary in the case of a general bomb threat, as their focus is primarily on protecting national figures rather than local threats unless there is a connection to a protected site.