July 1, 2011 7:18 pm Heat Takes Toll on National Mall Revelers Days before the big Fourth of July fireworks spectacular, there were already crowds converged on the National Mall. As Tom Sherwood reports, the heat has already taken its toll. Local 1:56 Dunbar students return to school after student shot through window 1:27 1 dead, 4 hurt in Suitland crash 3:27 How the pulley system helps first responders make rescues 0:24 1 killed, 23 others hurt in Maryland party bus crash 1:05 Court docs reveal moments leading up to Dunbar High School shooting that hurt teen