Al-Qaeda has hidden nuclear weapons ready to detonate?

I asked a question the night i heard osama was deseased asking if terrorists will retaliate and avenge the death of the leader. One response said that al-qaeda had claimed they had a nuclear bomb hidden in Europe that they were going to detonate if the U.S and allies did succeed in killing OBL, or other leaders. i was wondering if we knew any truth to this statement and if there was a bomb that had been discovered. Because i never have heard this before. Please include Links if you can. thank you all ahead of time.