On April 2, 2021, an attack targeting the United States Capitol unfolded when a man drove his car into a barricade set up by the Capitol Police. The vehicle struck two officers, resulting in the death of Officer William Evans and injuries to another officer. This incident was particularly alarming, given the heightened security measures implemented at the Capitol in the wake of the January 6 insurrection, which had raised fears of further violence against governmental institutions.

The assailant, later identified as Noah Green, was shot by law enforcement after exiting his car wielding a knife. Initial reports suggested that the motive behind the attack might be connected to mental health issues, though it raised immediate concerns about security in one of the most protected areas of the United States. The Capitol was subjected to intense scrutiny regarding its safety protocols, leading to a reevaluation of how to protect congressional members and staff.

In response to the attack, law enforcement agencies, including the Capitol Police and the FBI, rapidly launched investigations. The incident brought attention to ongoing debates about domestic terrorism and the vulnerabilities of essential governmental structures. Furthermore, it emphasized the urgent need for comprehensive security reforms to ensure the safety of Capitol personnel against threats from within the country.