In post-Jan. 6 era, 600 officers train for riots as threats to lawmakers climb toward record high
The U.S. Capitol Police led a massive training exercise in Maryland to improve coordination among law enforcement agencies.
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Law enforcement agencies are bracing for a volatile era defined by surging political violence and swelling protest movements.
Five years after the Capitol riot, some of the police officers who fought off the rioters that day say they're still struggling with what happened.
