TEHRAN (AFP/Reuters) - Iran summoned Pakistan ambassador over the deadly bombing of a mosque in the southeast after rebels reportedly claimed responsibility, the official IRNA news agency reported on Saturday. Mohammad Bakhsh Abbasi was summoned after Irans state television quoted the pan-Arab channel Al-Arabiya as saying that the Jandullah (Soldiers of God) group said it was behind Thursdays mosque attack which killed 30 people. According to state television, the chief of the Iranian armed forces, General Hassan Firouzabadi, said on Saturday that Iran 'has located the base of the groups head and informed Pakistans government of his arrest. The Iranian authorities said they immediately arrested three men involved in the bombing. The trio were executed on Saturday morning near the mosque in Zahedan city, the capital of Sistan-Baluchestan province. In recent years, the restive province has been the scene of a deadly insurgency by Jundallah, which is strongly opposed to the government of predominantly Shia Iran. The province has a substantial Sunni minority and lies on a major narcotics-smuggling route from Afghanistan and Pakistan. Meanwhile, an Iranian official accused the United States of involvement in a mosque bombing that killed 30 people. Washington denied the allegation. Jalal Sayyah, of the governors office in Sistan-Baluchestan province, said three people had been arrested in connection with the blast on Thursday in a crowded mosque in the city of Zahedan, in a region where many of Irans minority Sunnis live. The terrorists, who were equipped by America in one of our neighbouring countries, carried out this criminal act in their efforts to create religious conflict and fear and to influence the presidential election, Sayyah told state radio.