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      Suspicious powder shuts down Quantico post office

      The Post Office at Marine Corps Base Quantico was closed Monday morning while authorities investigated a suspicious powder Monday morning.

      The object, however, tested negative for any dangerous substance.

      Quantico officials said on their Facebook page that a suspicious package containing the powder was discovered at the base's post office Monday morning.

      Four people, including two Marine postal specialists, a civilian postal clerk and a customer, were inside when the powder was found. No one was injured or sickened.