A batch of enriched uranium has been smuggled into Sudan from an unidentified African country and is being offered for sale, Prime Minister Sadek Mahdi said. He told a news conference that authorities had seized 8.8 pounds of the material but that another 15.4 pounds had not been found. Rumors have circulated in Khartoum that merchants claiming to be from Zaire, a uranium producer, were offering about two pounds of enriched uranium for $400,000. Most nuclear reactors use slightly enriched uranium as fuel. Nuclear weapons require greatly enriched uranium.