ATTACK ON THE RUNWAY.

DIANE SAWYER (ABC NEWS) (Off-camera) Good evening. After a tense week for the US in Afghanistan, there was another white-knuckle moment that nearly turned into a global crisis today. A truck, on the runway, just as Secretary of Defense Leon Panetta was about to land and moments later, the driver, an Afghan who has worked as a translator for American forces, went up in flames. ABC's Nick Schifrin is in Kabul to tell us what he has learned about this latest drama today. Nick? [ABSTRACT FROM PUBLISHER]