Conflict at US 250th Anniversary: National Guard vs. Fairgoers — photo 3 of 4

Tensions flared at the Great American State Fair in Washington, D.C., during the 250th anniversary celebration of the United States. Visitors clashed with the National Guard after the event was evacuated due to extreme heat. Footage from TMZ shows attendees booing and chanting 'USA, USA' as service members tried to keep the crowd at bay.