The last major remnant of Saddam Hussein's nuclear program - a huge stockpile of concentrated natural uranium - reached a Canadian port Saturday to complete a secret U.S. operation that included a two-week airlift from Baghdad and a ship voyage crossing two oceans.

The removal of 550 metric tons of 'yellowcake' - the seed material for higher-grade nuclear enrichment - was a significant step toward closing the books on Saddam's nuclear legacy. It also brought relief to U.S. and Iraqi authorities who had worried the cache would reach insurgents or smugglers crossing to Iran to aid its nuclear ambitions.

The Iraqi government sold the yellowcake to a Canadian uranium producer, Cameco Corp., in a transaction the official described as worth 'tens of millions of dollars.' A Cameco spokesman, Lyle Krahn, declined to discuss the price, but said the yellowcake will be processed at facilities in Ontario for use in energy-producing reactors.

The yellowcake wasn't the only dangerous item removed from Tuwaitha.

Earlier this year, the military withdrew four devices for controlled radiation exposure from the former nuclear complex. The lead-enclosed irradiation units, used to decontaminate food and other items, contain elements of high radioactivity that could potentially be used in a weapon, according to the official. Their Ottawa-based manufacturer, MDS Nordion, took them back for free, the official said.

Nouri al-Maliki, Iraq's prime minister, who has also led a crackdown on the Shi'ite Mahdi Army in Basra and Baghdad in recent months, claimed yesterday that his government had 'defeated' terrorism.

'I am not somebody -- unlike George Bush -- who is willing to ignore facts on the basis of my preconceived notions.'