WASHINGTON - The United States has designated the Iranian group Jundullah as a terrorist organisation, the State Department announced Wednesday. The designation is significant, because Iranian leaders have in the past accused the United States of providing covert support to the group which has carried out terrorist attacks, killing Iranian Revolutionary Guards Corps officers and civilians. The United States has denied that charge. Some US experts see the designation as a signal to Iran ahead of the negotiations on Iranian nuclear programme that are expected to take place in Europe later this month. The designation of Jundullah shows one bureaucratic fight in favour of engagement was won, one expert said. But whether its sufficient or not and how it is followed up remains to be seen. Jundullah was founded by Abdolmalek Rigi who was captured and executed in Iran earlier this year. He told Press TV that he had the support of US officials in Afghanistan. The Pentagon denied the claims. While listing it as a terrorist organisation, the State Department said Jundullah was targeting Iranian interests in the south of the Islamic republic. Jundullah uses a variety of terrorist tactics, including suicide bombings, ambushes, kidnappings and targeted assassinations, the State Department said. Iranian President Mahmoud Ahmadinejad accused the United States of playing a role in two July bombings in southern Iran carried out by Jundullah. No grouping other than US-backed terrorist groups, which are devoid of human feelings can commit such acts, he was quoted by the official Islamic Republic News Agency as saying at the time. Washington at the time had yet to place the group on its terrorist list.