If the CIA knew a terrorist attack was imminent, how did it occur right under their noses?

http://abcnews.go.com/Blotter/cruise-missiles-strike-yemen/story?id=9375236 Obama Ordered U.S. Military Strike on Yemen Terrorists “On orders from President Barack Obama, the U.S. military launched cruise missiles early Thursday against two suspected al-Qaeda sites in Yemen, administration officials told ABC News in a report broadcast on ABC World News with Charles Gibson. “One of the targeted sites was a suspected al [...]

How many people knew there was such a place as Yemen?

Until two days ago and could they find it on a map? Yemen is all we’re hearing now and I haven’t heard anybody on either side even mention it before.