A court in Iran has sentenced two US-Iranians to 10 years in prison each on spying charges, news agency Mizan reported Tuesday.
Guilty verdicts were handed down to business consultant Siamak Namazi and his father Baqer Namazi, a former official for UNICEF.
Iranian authorities said that they had video material which showed the two men were involved in a spy operation.
UNICEF, with which Baqer Namazi had previously worked as a representative to Somalia, Kenya and Egypt, noted the sentence with "sadness and personal concern," said Stephane Dujarric, spokesman for UN Secretary General Ban Ki-moon.
"He deserves a peaceful retirement and UNICEF appeals for his release on humanitarian grounds," Dujarric said.
The US was also "deeply concerned" about the sentencing noting that the two men had been "unjustly detained," said Mark Toner, a spokesman for the US State Department.
"We join recent calls by international organizations and UN human rights experts for the immediate release of all US citizens unjustly detained in Iran, including Siamak and Baquer Namazi, so that they can return to their families," Toner said.
The father and son have been in the notorious Evin prison since the beginning of the year.