Unidentified laboratories (Holowan Laboratories)
Following the conclusion of the Clone Wars, five identical IG-88 assassin droids were activated at Holowan Laboratories; subsequently, they slaughtered the scientists who created them and fled their laboratories, dispersing into the galaxy.
Sources
- Star Wars: The Complete Visual Dictionary, New Edition (First mentioned)
- Ultimate Star Wars, New Edition
- Scene to Stats: IG-Series Assassin Droid on Atomic Mass Games' official website (backup link)