according to indonesian accounts, on 14 october, kido's men disarmed indonesian guards of a water reservoir. later that day, an indonesian doctor named kariadi was shot and killed while he was heading to the reservoir to check the water for any poison. near the location, over 300 japanese civilians who had been relocated from kendal were temporarily stationed at boeloe prison. the indonesian special police tried to lead the group away around 10:30 pm that day, but the group offered resistance with melee weapons and some small arms smuggled in by kido's men. the group was slaughtered, with only a handful managing to escape.