Two Iranian Christians this month refused to renounce their faith in court in exchange for freedom and were sent back to jail and told to await a verdict.
Iranian refugees in Turkey are converting from Islam to Christianity in such numbers that churches can't keep up with the demand, experts in the region say.
Two Christian converts from Islam planning to meet in a northern city of Iran were detained on the same day, part of what rights advocates say could be part of a rash of arrests in the area.
Rights groups learned last week that two Christians in Iran have been sentenced to prison, the latest in a series of convictions on fabricated charges.
The four Iranian Christians who saw their ten-year prison sentences upheld by an appeal court earlier this month are expecting to have to report to prison any day now.