tag:bbc.co.uk,2008:cps:playlist:mediaAsset:14347433 9/11: Video shows hijackers being screened Footage shows the five hijackers who flew American Flight 77 into the Pentagon progressing through security checks at Washington's Dulles International Airport. 2011-07-29T15:15:54Z en News 14347433 99127 blocked tag:bbc.co.uk,2008:cps:mediaAsset:14347433