Gulf Arab leaders have called on Iran to do more to show it was not trying to obtain an atom bomb, thereby saving the region from another war. Gulf Arab countries, wary of Iran's power since the 1979 Islamic Revolution, share US concern about the prospect of Iran having a nuclear bomb but fear another military conflict in the region after the 2003 US-led invasion of Iraq. Gulf Arabs are also worried about the possible environmental effects of a US attack on Iran's nuclear plant at Bushehr on the opposite side of the Gulf, or of leakage from unmonitored Iranian sites."We appreciate Iran's efforts to reassure the region over its programme," Sheikh Abdullah bin Zayed al-Nahayan, United Arab Emirates foreign minister, said after a summit of the Gulf Cooperation Council (GCC) in Riyadh on Saturday. "But for the sake of stability and to avoid any environmental disaster, there needs to be more Iranian guarantees and we are trying to ensure this."