Five days ago, a mob stormed the US Capitol, the seat of American government and — supposedly — one of the most secure and heavily guarded buildings in the country. Now lawmakers, security officials, and voters are trying to piece together what happened, and more details are emerging about the security failures that led to a siege not seen since 1812. And many are pointing to evidence of complicity by police officers who appeared to stand by or even assist rioters whose actions ended up causing a fellow officer’s death. What’s clear so far is that Capitol Police and federal law enforcement were woefully unprepared for the size and violence of the crowd at the Capitol, despite repeated warnings in the days leading up to the event. One activist, for example, told the Washington Post she was so disturbed by threats on Parler and other social media sites that she called the FBI in late December, telling the agency, “they’re planning to kill members of Congress and they’re openly discussing bringing guns over state lines.”