TEHRAN: Iran has arrested a top reformist from a banned political party which backed opposition leader Mir Hossein Mousavi in last year's presidential election, the ISNA news agency reported on Wednesday. Ali Shakouri-rat, a leader of the Islamic Iran Participation Front, was “arrested yesterday (Tuesday) night for security reasons,” the news agency quoted Tehran prosecutor Abbas Jafari Dolatabadi as saying. Shakouri-rat is known for his outspoken criticism of President Mahmoud Ahmadinejad's government. In September, Iran banned two reformist parties -- the Islamic Iran Participation Front and the Islamic Revolution Mujahedeen Organization-after they backed Mousavi in the June 2009 presidential election.The two parties were accused of undermining national security. After the disputed election results which gave Ahmadinejad a second term, several high-ranking members of both parties were arrested and sentenced to long prison terms in a major government crackdown on reformists, political activists and journalists. – Agence France