Not much mystery to it.
Their nuke tech was exported to Libya, Syria, and possibly Iran in a clumsy and dangerous attempt to create parity with and stalemate Israel.
Had they not done so, the North Koreans and Chinese would have, Pandora's box has been open for some time.
Do not doubt that the Saudi's and Egytians want the bomb also and will obtain one ASAP.
The Pakis are mainly afraid of/angry with India.
They will never let AQ get one, frankly, AQ wouldn't ever have the logistical support to maintain one. Giving AQ a bomb would terminate the Pakis entire program and leave them at a severe disadvantage with India, ain't gonna happen.
Um... that's easy.
Ask Mossad. I'll bet they know!
- John