Iran activist Ghoncheh Ghavami 'on hunger strike' 3 November 2014 Last updated at 20:12 A British-Iranian woman held in Iran after trying to watch a men's volleyball match is on hunger strike for the second time, her family says. Ghoncheh Ghavami was protesting against what she called her illegal detention, her mother told the BBC. Ms Ghavami's lawyer has said he saw court documents showing she had been sentenced to a year in prison. However, prosecutors have not confirmed Ms Ghavami's sentence, leaving her case in limbo, her family says. Anti-regime propaganda Ms Ghavami's mother, Susan Moshtaghian, told BBC Persian TV that her daughter was striking against her continued detention without a court order, and the judiciary's decision to keep her case in limbo. On Sunday, lawyer Alizadeh Tabatabaie said he had been shown court documents that said Ms Ghavami was found guilty of spreading anti-regime propaganda. However, the Central Revolutionary Court has returned her case to the prosecutor's office without confirming the sentence or explaining the delay in her case, BBC Persian TV correspondent Kasra Naji reports. Ms Ghavami, 25, was part of a group of women who tried to watch Iran play Italy in a match on 20 June. The UK's Foreign Office has said it is concerned about her case. Ms Ghavami is both a British and Iranian national. However, dual nationality is not recognised in Iran. The British government recognises dual nationality. However, under international law, countries cannot offer formal diplomatic protection to their nationals if they are in a second country where they also hold nationality.