Iran has executed an Iranian nuclear scientist detained in 2010 when he returned home from the United States, after a court convicted him of spying for Washington, a spokesman for the judiciary said on Sunday.

“Through his connection with the United States, (Shahram) Amiri gave vital information about the country to the enemy,” Gholamhossein Mohseni Ejei told a weekly news conference, state news agency IRNA reported.

Mohseni Ejei said a court had sentenced Amiri to death and the sentence had been upheld by Iran’s Supreme court, IRNA said.

Amiri, a university researcher working for Iran’s Atomic Energy Organisation, disappeared during a pilgrimage to Saudi Arabia in 2009, and later surfaced in the United States. But he returned to Iran in 2010 and received a hero’s welcome before being arrested.

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