How are bomb threats most commonly delivered?

Bomb threats are most commonly delivered via phone calls. This method has historically been favored due to its immediate and anonymous nature. When a threat is made over the phone, it allows the caller to instill a sense of urgency and fear, which can lead to quicker responses from authorities. The auditory aspect of a phone call can also evoke a stronger emotional reaction than a written note or email might. Moreover, phone calls can be made from any location, making it difficult to trace the origin immediately, thus enhancing the caller's anonymity.

Other methods, such as notes or emails, typically lack the immediacy and can be scrutinized more easily by law enforcement. In-person threats may also occur but are less common because they expose the individual to potential identification and capture by authorities. Therefore, the phone remains the most prevalent medium for delivering bomb threats.