Shahram Amiri had been in custody in Iran since 2010.
"Shahram Amiri had access to the system's top secrets and had gotten connected with our number one enemy the Great Satan," Iranian judicial spokesman Hojjat al-Eslam Mehdi Mohseni-Ejehei told reporters Sunday, according to state news agency IRNA.
Amiri's case had been reviewed by the Iranian high court, which upheld the conviction, according to Mohseni-Ejehei. "The Iranian High Court reviewed this decision with extreme care given the allegations of espionage," he said.
