This picture released by Iran's official Islamic Republic News Agency shows the scene of the bomb blast in the city of Zahedan, 940 miles southeast of the capital Tehran Thursday, July 15, 2010. Twin bombings killed more than 20 people outside a mosque in southeastern Iran on Thursday -- including members of the powerful Revolutionary Guard -- in attacks that came less than a month after Iran hanged the leader of a militant insurgent group in the region. (AP Photo/Islamic Republic News Agency, IRNA)

Photo by: STR

This picture released by Iran's official Islamic Republic News Agency shows the scene of the bomb blast in the city of Zahedan, 940 miles southeast of the capital Tehran Thursday, July 15, 2010. Twin bombings killed more than 20 people outside a mosque in southeastern Iran on Thursday -- including members of the powerful Revolutionary Guard -- in attacks that came less than a month after Iran hanged the leader of a militant insurgent group in the region. (AP Photo/Islamic Republic News Agency, IRNA)