Iranian rebel group Jundallah on May 29 reportedly claimed responsibility for the bombing of a Shiite mosque in the eastern city of Zahedan. According to Iranian authorities, the attack, which killed as many as 30 people and wounded many others, involved a suicide bomber. The attack comes two weeks before crucial presidential elections in which Iranian President Mahmoud Ahmadinejad faces a major challenge and at a time when the Obama administration is pushing a major diplomatic initiative with the clerical regime. Jundallah is a Sunni Islamist Balochi rebel group active in Iran's southeastern Sistan-Balochistan province along the border with Afghanistan and Pakistan.