[FreeReign]

According to US intelligence estimates, they have between 8 and 10 right now. I've seen (publicly stated) estimates as high as 15 by other intelligence agencies.

Source? Link?

[NJ_gent]

Here and here will have to do for now until I can relocate the estimates published on the state department's website. I misspoke, however. It wasn't a foreign intelligence agency that put the stimate as high as 15; it was the (US) Defense Intelligence Agency - or rather some people from it.