By DAVID E. SANGER and WILLIAM J. BROAD
WASHINGTON — Six months after the revelation of a secret nuclear enrichment site in Iran, international inspectors and Western intelligence agencies say they suspect that Tehran is preparing to build more sites in defiance of United Nations demands.
The United Nations inspectors assigned to monitor Iran’s nuclear program are now searching for evidence of two such sites, prompted by recent comments by a top Iranian official that drew little attention in the West, and are looking into a mystery about the whereabouts of recently manufactured uranium enrichment equipment.
In an interview with the Iranian Student News Agency, the official, Ali Akbar Salehi, head of Iran’s Atomic Energy Organization, said President Mahmoud Ahmadinejad had ordered work to begin soon on two new plants. The plants, he said, “will be built inside mountains,” presumably to protect them from attacks.
“God willing,” Mr. Salehi was quoted as saying, “we may start the construction of two new enrichment sites” in the Iranian new year, which began March 21.