Iranian media claimed Mossad had promised the scientist a foreign passport should he complete a long-term collaboration, after meeting five times in Vienna. Rouzbeh Vadi, who state media said was executed on Wednesday for giving information on Iran's nuclear program to Israel's Mossad spy agency,

After the war with Israel, Iranian authorities have swept up hundreds of people deemed suspected infiltrators. But the arrest and hanging of the nuclear scientist Roozbeh Vadi was a rare move.

In a rare move, Iran has executed a top nuclear scientist accused of spying for Israel—exposing just how deeply foreign intelligence may have infiltrated one of the country's most sensitive programs,