Law enforcement officers are seen near the entrance of the Pentagon after a report of an active shooter and lockdown in Washington, DC on August 3, 2021. - The Pentagon was on lockdown after a shooting at a subway station just outside the secure US military headquarters. Employees in the US Defense Department headquarters in the Arlington suburb of Washington were ordered to shelter in place amid reports of several gunshots and injuries in the station, the entrance of which is just a few dozen yards (meters) from the building's main doors. (Photo by Olivier DOULIERY / AFP)