The agency adds that there are still 1,000 radioactive sources that are unaccounted for in Iraq. And of 25 sources stolen from the Krakatau steel company in Indonesia in October 2000, only three have been recovered.
http://www.theage.com.au/articles/2004/06/02/1086058919614.html

A terrorist attack of this kind is "a nightmare waiting to happen," Frank Barnaby, a nuclear consultant and former British nuclear military scientist, was quoted by New Scientist as saying.

"I'm amazed that it hasn't happened already."

Eliza Manningham-Buller, director-general of the British counter-intelligence agency MI5, had said last year that a crude radiological attack against a major western city was "only a matter of time," the report said.