What happened
Fifteen people were killed when armed men entered a gathering in Lima’s Barrios Altos neighborhood in 1991. The attackers were later linked to the military intelligence-linked Colina Group.
The investigation
Human-rights investigations and later judicial proceedings reconstructed the operation and connected it to a broader pattern of extrajudicial violence during Peru’s internal conflict.
What the courts or investigators concluded
Members of the Colina Group were convicted, and the massacre became part of cases used to establish responsibility at senior levels of government.
Why the case remains significant
Barrios Altos is significant both as a criminal case and as a regional human-rights precedent concerning accountability, amnesty laws and crimes committed under the claim of counterterrorism.
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.