"There are a number of measures that we have in place out there. Every time an incident occurs, whether it's here or anywhere else across the nation or in the world, we do after-action [reports] on those, we examine them, we look for things that we can do to improve," Kusse said.
Kusse said it was too soon to know whether the suspect was attempting to breach the building or whether it was terrorism related.
Authorities and Pentagon officials did not immediately provide details on the sequence of events.
The Arlington County Fire Department reported “multiple patients,” but it wasn’t immediately clear if they had been shot and the extent of their injuries were unknown.
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