What happened
A gunman entered the cantonal parliament building in Zug in 2001 and killed fourteen people before taking his own life.
The investigation
Investigators reconstructed a long-running grievance against public authorities and the way the attacker obtained weapons and accessed the building.
What the courts or investigators concluded
The perpetrator died at the scene, so there was no criminal trial.
Why the case remains significant
The massacre transformed security practices around Swiss government buildings and remains one of the country’s deadliest acts of domestic mass violence.
Case context
Crime by Region organizes cases geographically so readers can move from one file to other investigations from the same country. For unresolved or contested cases, the wording above reflects the distinction between confirmed events, investigative theories and findings actually established in court.