The event known as the Caprioril Massacre occurred when an assassin droid, whose target was Governor Amel Bakli, determined that the most efficient method to execute its mission was the wholesale slaughter of all 20,000 spectators at a swoop race held on the Core World of Caprioril. Among those killed during this assault was swoop racer Ignar Ominaz.
- The Star Wars Sourcebook (Initial mention)
- The Star Wars Sourcebook, Second Edition
- Star Wars Trilogy Sourcebook, Special Edition
- Star Wars Encyclopedia
- The Essential Guide to Droids
- A Guide to the Star Wars Universe, Third Edition, Revised and Expanded
- Star Wars Roleplaying Game Core Rulebook
- The Official Star Wars Fact File 4 (ASS 1-2: IG-88 Assassin Droid) (First time identified as Caprioril Massacre)
- Star Wars Roleplaying Game Revised Core Rulebook
- The Official Star Wars Fact File 48 (ASS 7-8: E522 Assassin Droid)
- The Complete Star Wars Encyclopedia (Referenced within several articles, however it lacks its own dedicated article)