The other threat is from people like the Real IRA (Irish Republican Army) -- unlike al Qaeda, the Real IRA are actually building 400-lb bombs, and these bombs are getting caught and intercepted due to intelligence operations.

CNN: Is Olympic-level security already under way in Britain?

London and Dublin hope their document will result in a historic declaration from the Irish Republican Army (IRA) that it will abandon all paramilitary activity.

CNN: Bush urges N. Ireland peace moves

But the most popular accused culprit remains the Irish Republican Army (IRA), whom the Aga Khan and his syndicate of owners officially blamed for the kidnap, though authorities have never named a suspect.

CNN: February 7, 2013 -- Updated 1450 GMT (2250 HKT)