... understanding of terrorism and ultimately weakens counterterrorism efforts. The Original PGIS Database To address this lack of empirical data, we coded and verified a previously unavailable data ... explains what happened to the victims in a kidnapping or hijacking (or a facility attack where people were taken hostage). For example, an incident card may have written “6 passengers released” ... year. The database contains nine unique event types; seven of which were defined a priori by PGIS, including bombing, assassination, facility attack, hijacking, kidnapping, assault, and maiming...