On October 8, 2011, anti-war protesters at the Smithsonian Institution's National Air and Space Museum in Washington, D.C. were pepper-sprayed by security forces and the museum was closed early. The protesters, estimated at 100 to 200 people, had planned to participate in a "die-in" at the museum's "Military Unmanned Aerial Vehicles" exhibit to protest the massive military spending and the U.S. use of unmanned military drones against civilians in the war in Afghanistan. Under the Obama administration, drone strikes quadrupled from less than 50 under the Bush administration to more than 220 in the past three years. Dozens of protesters were sickened by the pepper spray, and several people fell to the ground in agony.