I don't know a lot of details because the story only got about one day of play. Apparently, that's how the materials in Rotterdam were discovered. It's all scrap metal that entered the markets prior to the Iraq invasion. Seems the major international ports now have detection of radioactive material, and when the source was tracked-down at the port, the authorities discovered old missle parts that still had UN inspection tags on them.
Saddam still poisoning us.