Iran jails 6 people over charges of espionage for U.S.
Following the release of the news, the U.S. State Department demanded the "immediate release" of the two Iranian-Americans by Iran.
Siamak Namazi was arrested in October 2015 and his father, Baqer Namazi, was detained in February this year.
Reportedly, Siamak formerly worked for the Sharjah-based oil and gas company Crescent Petroleum.
Baqer is a former Iranian provincial governor and served as a UNICEF representative in Somalia, Kenya, Egypt and other countries.