April 17, 2012 1:10 pm Crowds Gather on National Mall for Discovery NBC4’s Tracee Wilkins was on the National Mall with the crowds that gathered to see the space shuttle Discovery make its final flight. Local 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 2:29 George Washington University president says pro-Palestinian encampment is ‘unlawful'