Unknown Substance Eliminated as a Threat Published Dec. 8, 2011 By 011211 KEESLER AIR FORCE BASE, Miss. -- During a routine mail sort on the second floor of the Locker House on Keesler Air Force Base, a sorter noted a powder-like substance on her hands. Officials were called in to investigate the situation. All precautions were initiated to ensure the safety of all involved and the surrounding community. These precautions included evacuating the building and diverting traffic on base surrounding this building. The base's fire and bioenvironmental teams were called in to test the substance for possible hazardous material matches. No matches were made, the area was declared safe and the base has returned to normal operations.