Hizbullah instructors trained Shi'ite militiamen at remote camps in southern Iraq until three months ago when they slipped across the border to Iran - presumably to continue instruction on Iranian soil, according to two Shi'ite lawmakers and a top army officer. The three Iraqis claim the Lebanese Shi'ites were also involved in planning some of the most brazen attacks against US-led forces, including the January 2007 raid on a provincial government compound in Karbala in which five Americans died. The allegations, made in separate interviews with The Associated Press, point not only to an Iranian hand in the Iraq war, but also to Hizbullah's willingness to expand beyond its Lebanese base and assume a broader role in the struggle against US influence in the Middle East. All this suggests that Shi'ite-dominated Iran is waging a proxy war against the United States to secure a dominant role in majority-Shi'ite Iraq, which has supplanted Lebanon as Teheran's top priority in the Middle East. "The stakes are much higher in Iraq, where there is a Shi'ite majority, oil, the shrine cities and borders with Saudi Arabia," said analyst Farid al-Khazen, a Christian Lebanese lawmaker whose party is allied with Hizbullah. "The big story is Iraq, and the Americans unwittingly opened it up for the Iranians" by their invasion in 2003, al-Khazen said. The allegations come as the United States and Iran are engaged in a showdown over Tehran's nuclear program and each country's role in Iraq. Iran, Hizbullah's mentor, denies giving any support to Shi'ite extremists in Iraq. But the three Iraqis who spoke to the AP said the Iranians prefer to use Hizbullah instructors because as Arabs, they can communicate better with the Iraqi Shi'ites and maintain a lower profile than Farsi-speakers from Iran. For Hizbullah, a high-risk role in Iraq could give the Lebanese movement leverage with the United States and broaden its appeal within the Arab world where anti-American sentiment remains strong. Iraqi officials have said little about a Hizbullah role in this country. However, President Jalal Talabani told US-funded Alhurra television this week that "there have been several occasions" when Hizbullah members or those who "claim to belong to Hizbullah" have been detained in Iraq. He gave no further details. But the two Iraqi lawmakers and the military officer said Hizbullah instructors work only with members of the Iraqi Shi'ite "special groups," the US military's name for splinter factions of anti-American cleric Muqtada al-Sadr's Mahdi Army militia. The US believes that Iran's elite Quds Force, a branch of Iran's Revolutionary Guard, supports the special groups. All three Iraqis spoke on condition of anonymity because they were not supposed to release the information. The lawmakers belong to al-Sadr's movement and were involved in the creation of the Mahdi Army in 2003. The military officer's job gives him access to highly classified intelligence information. They said Hizbullah began training Shi'ite militiamen in the second half of 2006 at two camps - Deir and Kutaiban - east of Basra near the Iranian border. They fled across the border in late March or early April this year after US-backed Iraqi forces launched a crackdown against militias in Basra, Iraq's second-largest city. In Iran, training resumed in camps once used by Iraqi exiles who fought with Iranian forces during the 1980s war between the two countries, the lawmakers said. Instruction includes explosives, ambushes and use of rockets and mortars. Citing testimony from special groups members in custody, the officer said the Hizbullah instructors never numbered more than 10 at any one time, kept a low profile and moved back and forth over the Iranian border. Indications that Hizbullah was playing a role in Iraq first surfaced last July when the US military announced the arrest of Ali Musa Daqduq, a Lebanese-born Hizbullah operative allegedly training Iraqi Shi'ite militiamen. At least one other Hizbullah operative, identified only as Faris, was detained in Basra during fighting there in April and was handed over to the Americans, the Iraqi military officer said. The US military has said little publicly about Hizbullah's involvement here since announcing Daqduq's arrest, though it has frequently alleged an Iranian role in arming, equipping and training Shi'ite extremists. "At this point in time, we do not have any new, releasable information regarding Hizbullah's involvement with special groups in Iran and Iraq," a military spokesman, Capt. Charles Calio, said in an e-mail to the AP. A Hizbullah spokesman in Beirut, Lebanon, refused to comment on any role for his organization. However, Ibrahim al-Ameen, a Lebanese newspaper editor close to Hizbullah, said in a recent interview in Beirut that Hizbullah's leader, Sheik Hassan Nasrallah, spends several hours daily dealing with "the situation in Iraq." Nasrallah, who studied Shi'ite theology in Iraq, spoke at length about Iraqi "resistance" during a speech last May that analysts believed was aimed at bolstering his image as a godfather of Arab opposition to the United States and Israel throughout the Middle East. Beside its alleged role in Iraq, Hizbullah is known to have ties to Hamas. The charismatic Nasrallah has become a sort of folk hero in the mostly Sunni Arab world after his guerrillas fought Israeli forces to a standstill in a 34-day war in 2006. A senior Western diplomat based in the Middle East said his government has information suggesting a growing Hizbullah interest in events in Iraq. However, the diplomat would say no more and insisted on anonymity because the subject is so sensitive. Hizbullah's possible role in direct attacks against US-led forces is murkier and more explosive. The two Iraqi lawmakers said Hizbullah operatives planned and supervised both the Karbala attack and the brazen daylight kidnapping of five British nationals from a Finance Ministry compound in Baghdad in May 2007. The Britons are still being held. In the Karbala attack, English-speaking militants wearing American uniforms and carrying American weapons stormed the compound, killing one US soldier and abducting four. The four were later found dead. A senior Mahdi Army commander in Baghdad, speaking on condition of anonymity because of the sensitivity of the information, said Hizbullah's operations in Iraq had been supervised by Imad Mughniyeh, a top commander of the guerrilla group killed in a car bomb in Syria last February. The shadowy figure was suspected of a role in the 1983 bombing of the US Marine barracks in Beirut and the 1992 attack on the Israeli Embassy in Buenos Aires, Argentina.