An Iranian court has convicted a US man of working for the CIA and sentenced him to death, state radio reported.

Iran says that Amir Mirzaei Hekmati, a former US military translator, received special training and served at US military bases in Iraq and Afghanistan before heading to Iran for his alleged intelligence mission.

The radio report on Monday did not say when the verdict was issued. Under Iranian law, Hekmati has 20 days to appeal.

Al Jazeera's Nicole Johnston reports.