TEHRAN (Reuters/AFP) - Iran hanged 13 members of a shadowy insurgent group Jundallah in a volatile southeastern area on Tuesday, but they were put to death in prison and not in public as initially planned, media reported. The official IRNA news agency said the insurgents were executed in prison in the restive southeastern border city of Zahedan, epicentre of a Sunni rebellion against the regime in Tehran. Thirteen members of this group were hanged this morning, provincial judiciary chief Ebrahim Hamidi was quoted as saying. The execution of a 14th member of Jundollah (Gods soldiers), a brother of its leader Abdolmalek Rigi, was postponed, Iranian news agencies said, without giving a reason for the delay or for the change in location. The rebels were accused of being mohareb (enemies of God) and of kidnapping foreigners, killing innocents and of carrying out terrorist acts for the Jundallah group, IRNA said, quoting a local judiciary statement. State media had announced on Monday that 14 members of Jundallah would be publicly executed on Tuesday. After last minute consultations, the executions were carried out in a prison, Hamidi said. Zahedan is the capital of Sistan-Balochestan province, which borders Afghanistan and Pakistan and is home to a sizeable ethnic Balochi population. Jundallah has claimed repeated attacks against Iranian government targets in the province which lies on a major trafficking route for narcotics destined for Europe and the Gulf. In the latest major strike, Jundallah claimed responsibility for a suicide bombing on a Shia mosque in Zahedan in May that killed 25 people, saying it was a revenge attack for the hanging of members of the Baloch minority. Amnesty had urged the Iranian authorities to halt the Jundallah executions, saying the rebels had not received a fair trial. The Iranian authorities must abide by their international obligations to uphold human rights and guarantee fair trials, which is all the more essential in death penalty cases, the London-based watchdogs Middle East and North Africa director Malcolm Smart said. Amnesty said all the accused were believed to have been arrested before the deadly attack on the Zahedan mosque, for which three people were hanged in May.