A seal on a door to a Federal Bureau of Investigation mobile command vehicle is seen during an FBI field training exercise at the Landmark Mall May 2...
{"Image ImageDescription": "A seal on a door to a Federal Bureau of Investigation mobile command vehicle is seen during an FBI field training exercise at the Landmark Mall May 2, 2014 in Alexandria, Virginia. The law enforcement agency held the training to practice responding to a terrorist attack in a public venue. AFP PHOTO/Brendan SMIALOWSKI (Photo by Brendan SMIALOWSKI / AFP) (Photo by BRENDAN SMIALOWSKI/AFP via Getty Images)"}