Story highlights Satellite imagery shows that Iran has moved heavy construction equipment to the area

A furious lobbying effort by both supporters and foes of the Iran nuclear deal continues in the Senate

Washington (CNN) The intelligence community believes Iran has been attempting to clean up the suspected nuclear site at Parchin prior to the arrival of international inspectors based on new satellite imagery, a senior intelligence official told CNN on Wednesday.

The commercial imagery shows that Iran has moved heavy construction equipment to the area. But the senior intelligence official, who is familiar with the imagery in question, said the U.S. is confident that such sanitization efforts cannot succeed because radioactive materials, if present, are extremely difficult to conceal.

"The (International Atomic Energy Agency) is familiar with sanitization efforts and the international community has confidence in the IAEA's technical expertise," the official said.

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Bloomberg first reported the satellite imagery at Parchin.

Sen. Chris Coons, D-Delaware, told reporters on Tuesday that he has "concerns about the vigorous efforts by Iran to sanitize Parchin."

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