Overview
A bomb threat or bomb scare is a threat, usually verbal or written, to detonate an explosive or incendiary device to cause property damage, death, injuries, and/or incite fear, whether or not such a device actually exists.
History
Bomb threats were used to incite fear and violence during the American Civil Rights Movement, during which leader of the movement Martin Luther King Jr. received multiple bomb threats during public addresses, and schools forced to integrate faced strong opposition, resulting in 43 bomb threats against Central High School in Arkansas being broadcast on TV and the radio.
Motivations
Supposed motives for bomb threats include: "humor, self assertion, anger, manipulation, aggression, hate and devaluation, omnipotence, fantasy, psychotic distortion, ideology, retaliation," and creating chaos. Many of the motives based on personal emotion are speculative. Many bomb threats that are not pranks are made as parts of other crimes, such as extortion, arson, or aircraft hijacking. Actual bombings for malicious destruction of property, terrorism, or murder are often perpetrated without warning.
Ideological
Bomb threats may be motivated by political or religious ideology and ideological differences, including political party and criticism, abortion, animal testing, eco-terrorism, and use of nuclear power. The aim of these threats is to draw attention to certain causes or incite fear and unrest among those who support causes in opposition to the threatener's views, Some threats are racially-motivated, while others are made against houses of worship or research and medical facilities.
From Wikipedia (CC BY-SA 4.0).