he Iranian nuclear scientist who claimed to have been abducted by the CIA before departing for his homeland Wednesday was paid more than $5 million by the agency to provide intelligence on Iran's nuclear program, U.S. officials said.

Shahram Amiri is not obligated to return the money but might be unable to access it after breaking off what U.S. officials described as significant cooperation with the CIA and abruptly returning to Iran. Officials said he might have left out of concern that the Tehran government would harm his family.