The Cold War led to the expansion of national defense government programs housed in offices in Northern Virginia near Washington, D.C., and correlative population growth. The Central Intelligence Agency in Langley was involved in various Cold War events, including as the target of Soviet espionage activities. The Pentagon, built during World War II as the headquarters of the Department of Defense, was one of the targets of the September 11, 2001 attacks; 189 people died at the site when a jet passenger plane was flown into the building. Mass shootings at Virginia Tech in 2007 and in Virginia Beach in 2019 led to passage of gun control measures in 2020. Racial injustice and the presence of Confederate monuments in Virginia have also led to large demonstrations, including in August 2017, when a white supremacist drove his car into protesters, killing one, and in June 2020, when protests that were part of the larger Black Lives Matter movement brought about the removal of statues on Monument Avenue in Richmond and elsewhere.