This sounds like a well planned robbery, they hit basically two armored cars, there from what I heard are no videos of the actual killers, and they struck when the chances of witnesses are lowest, and they were ruthless enough to wipe out all potential witnesses with the only mistake being that the fourth survived for a time.
This was well planned and well scouted and they knew there was a lack of cameras in that area.
Unless the cops get really lucky they might actually get away with this.
Reminds me of what Darnell Bass tried to achieve
http://www.canada.com/calgaryherald/...e1f361&k=99917