Iran has formally charged two Iranian- American academics currently in jail in Tehran with espionage.
A judiciary official said a third Iranian-American, Nazi Azima, who works for Radio Free Europe, faced the same allegations but had not been arrested.
The BBC's Tehran correspondent says the arrests of dual nationals have sparked unease in Iran.
Those in contact with foreigners now fear they too may be accused of spying, Frances Harrison reports.
The judicial spokesman, Ali Reza Jamshidi, said both Haleh Esfandiari and Kian Tajbaksh were formally charged with spying, acting against Iran's national security and conducting propaganda against the Islamic Republic.
clipped from: news.bbc.co.uk