April 4, 2011 3:00 pm Implosion at Old Washington Convention Center File footage of the demolition of D.C.’s old Washington Convention Center, December 18, 2004. Local 0:32 Photo shows person riding on back of Metro rail car 2:12 2 teens arrested in Greenbelt senior skip day shooting 2:15 Veteran of wars in Iraq, Afghanistan killed in Laurel hit-and-run 3:28 Social media and teens' mental health: A psychiatrist weighs in 1:41 DC-area police ramp up traffic enforcement in pedestrian safety campaign