The number of National Guard troops coming into Washington, D.C. to help with inauguration security has grown to 21,000.
Army General Daniel Hokanson, chief of the National Guard Bureau, said at a briefing Thursday that number could go even higher as law enforcement agencies review ongoing threats in light of last week's deadly mob attack at the Capitol.
D.C. Mayor Muriel Bowser said, "Clearly we are in unchartered waters."
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