Washington, D.C., investigators believe a loose metal strip may have snagged a rider's bag, triggering a chain reaction. WRC's Chris Gordon reports.Aug. 9, 2012
UP NEXT
Palestinian militants, Israeli military exchange fire after Jenin raid
00:46
Suspect reportedly admits to Half Moon Bay shooting in jail interview
01:50
More Asian Americans embracing ballroom amid Monterey Park tragedy
01:19
Tyre Nichols’s mother calls for peaceful protest ahead of video release
01:47
Illinois Holocaust Museum preserves survivors' stories through virtual reality
06:52
As NASA looks ahead to Mars the agency remains remembering its past