The Iranian Embassy released a third letter purportedly written by British sailor Faye Turney on Friday saying she has been "sacrificed" to the policies of the British and US governments.
The letter, addressed to the British people, also said that Turney had been treated well, unlike the prisoners held at Abu Ghraib prison in Iraq.
"I am writing to you as a British serviceperson who has been sent to Iraq, sacrificed due to the intervening policies of the Bush and Blair governments," the letter said.
"Whereas we hear and see on the news the way that prisoners were treated in Abu Ghraib and other Iraqi jails by the British and American personnel, I have received total respect and faced no harm," she said.
"It is now our time to ask our government to make a change to its oppressive behavior towards other people."