<P> The Dunbar Armored robbery is the largest cash robbery to have occurred in the United States . It occurred in 1997 at the Dunbar Armored facility in Los Angeles, California . The thieves made off with some US $18.9 million ($28.2 million today). </P> <P> The robbery was masterminded by Allen Pace, who worked for Dunbar as a regional safety inspector . While on the job, Pace had time to photograph and examine the company's Los Angeles armored car depot . He recruited five of his childhood friends, and on the night of Friday, September 12, 1997, Pace used his keys to gain admittance to the facility . Pace had timed the security cameras and determined how they could be avoided . Once inside, they waited within the staff cafeteria, ambushing the guards one by one, who were having a break every night at exactly 12: 30 AM . </P>

When was the last time an armored truck was robbed