U.S. built major Iranian nuclear facility...

Interesting article...
The Tehran Research Reactor represents a little-known aspect of the international uproar over the country's alleged weapons program. Not only did the U.S. provide the reactor in the 1960s as part of a Cold War strategy, America also supplied the weapons-grade uranium needed to power the facility—fuel that remains in Iran and could be used to help make nuclear arms.
U.S. built major Iranian nuclear facility, sun-sentinel.com, August 23, 2006