On January 6, 2021, a mob attacked the U.S. Capitol Building in an attempt to thwart the certification of the 2020 Presidential election.
The riot resulted in the death of Officer Brian Sicknick, the police-involved shooting death of one attacker as she tried to gain access to the U.S. House of Representatives and the deaths of three participants from medical emergencies.
Fallout from the siege included the resignation of Capitol Police Chief Steven Sund amid criticism of law enforcement's preparation and response to the insurrection, as well as an investigation into the actions of some officers working during the breach and of off-duty officers who were in D.C. for the rally.