Casually-dressed hijackers set off metal detectors

THE video footage acquired by the Associated Press newsagency at Dulles Airport shows hijackers Khalid al-Mihdhar and Majed Moqed, each dressed in trousers and collared shirts, setting off metal detectors as they pass through security around 7:18am.

Moqed set off a second alarm, and a screener manually checked him with a handheld metal detector.

The pair were known to have travelled together previously and had paid cash to purchase their tickets aboard Flight 77.