EXCLUSIVE: The Conversation - Terror Threat From Yemen

An ABC News Exclusive: Diane Sawyer talks to Brian Ross about new revelations coming out of Yemen. There is now a major effort to track down Americans in Yemen who may have associated with the radical Muslim Cleric Anwar Al Awlaki.

Ross also reports that suicide bombers may have been sent out of Yemen to the US. This comes on the heels of the revelation that six different people on the no-fly list tried to board various planes in a 48 hour period.

Will this mean more terror alerts? Is airport security ready? All this and more in today's Conversation.