The inspectors at the International Atomic Energy Agency base their suspicions on a mix of satellite photographs indicating the testing of high explosives and procurement records showing the purchase of equipment that can be used for enriching uranium, the diplomats said. Both are critical steps in the development of nuclear arms.

The suspicions were aired here as an Iranian opposition group was preparing to release what it called new information that Iran was secretly developing a nuclear-capable missile whose range is significantly greater than what the Iranians have publicly acknowledged to date.

[. . .]

Mohamed ElBaradei, the director general of the I.A.E.A., said in an interview here on Wednesday that he had repeatedly asked Iran for access to the two sites, but that it had not yet been granted.

"We are following every credible piece of information," he said. Understanding the exact significance of what is happening at the two military sites is "important," he added. "We still have work to do, a lot of work." He estimated that even with full Iranian cooperation, it would take at least two years to resolve all of the outstanding questions surrounding the country's nuclear program.

"We're not rushing," he said. "It takes time."

From California Yankee.