US Secretary of State Hillary Clinton says she is "deeply disappointed" by the jail terms given to two US citizens found guilty of spying in Iran.
Shane Bauer and Josh Fattal were sentenced in Tehran on Saturday to three years for illegally entering Iran and five years for spying.
The men deny the charges, saying only they may have accidentally entered Iran while hiking in Iraq in July 2009.
Their lawyer has said they intend to appeal against the verdict.
"We have 20 days to appeal and I will try my best to use all legal means to annul the sentence," said Masoud Shafiee.