Iran arrested two prominent reformists on Tuesday, their aides said, amid mounting unrest over the disputed election victory of President Mahmoud Ahmadinejad. A founding member of Nobel peace prize winner Shirin Ebadi's human rights group was also arrested on Tuesday, a colleague said. The Fars new agency, quoting Intelligence Minister Gholam Hossein Mohseni Ejeie, said security forces had arrested another 26 'masterminds' of post-election unrest sweeping Tehran. Saeed Hajjarian and Mohammad Ali Abtahi, close aides of former reformist president Mohammad Khatami, were arrested at their homes before dawn, aides said. Hajjarian was picked up on a warrant issued by Tehran prosecutor Saeed Mortazavi, who is known for handling cases involving political activists and dissidents, said Issa Saharkhiz, an aide to Mehdi Karroubi, one of the defeated presidential candidates. Abtahi's arrest was confirmed by his office head Majid Ghadmali. Separately, Abdolfatah Soltani, a founder of the Human Rights Defenders Centre, was arrested at his office, said Mohammad Seifzadeh, a fellow founder. Seifzadeh said the arrest came in line with the pressures faced by the group in recent months following the closure of their office in a police raid in December. 'We are only a rights movement and do not back any political groups,' Seifzadeh said. The group, which is an outspoken critic of the human rights situation in Iran, has so far remained silent about the violence in the country amid protests over Ahmadinejad's disputed re-election. Scores of reformist leaders and journalists have been detained following the announcement of Ahmadinejad's victory in Friday's election. Iran has launched a crackdown on reformists, including journalists and political activists. A wave of protests and violence erupted after Ahmadinejad's landslide win over the more moderate Mir Hossein Mousavi. Several of those arrested are supporters of Mousavi, who has said Friday's poll was rigged and has demanded a fresh election. On Tuesday, Ejeie told Fars news agency that more than 26 'masterminds' of the Tehran violence have been arrested, in addition to a wave of initial arrests of 170 people reported on Sunday. He warned of more arrests if the riots continue. 