Noah Shachtman at Wired's Danger Room blog writes,
[A]dvanced military weapons are essentially robotic — picking targets out automatically, slewing into position, and waiting only for a human to pull the trigger. Most of the time. Once in a while, though, these machines start firing mysteriously on their own. The South African National Defence Force "is probing whether a software glitch led to an antiaircraft cannon malfunction that killed nine soldiers and seriously injured 14 others during a shooting exercise on Friday."
More terrifying news on that blog about our bloodthirsty borg overlords: