At least two US soldiers were killed in a second day of guerrilla attacks in Iraq, as Washington warned it will not tolerate an Iranian-style Islamist regime there. The newly-appointed UN special representative said he would arrive in Iraq by Monday to start work as US forces captured two more officials of the ousted Saddam's regime. The two soldiers were killed and nine others wounded when they came under attack in the flashpoint town of Fallujah, west of Baghdad, from a "hostile force of unknown size," US Central Command said. The command said two of the attackers were also killed and six captured after the early-morning ambush. Initial reports indicated the shots had been fired from inside a mosque, but Maj. Randy Martin, a spokesman for the U.S. Army's V Corps said that the Americans hit were at a traffic-control point just after midnight with gunfire from occupants of one of two vehicles that had pulled into the checkpoint together. On Monday, ambushers had targeted a military convoy on the highway between the massive US military camp at Baghdad airport and the occupation headquarters in the city center, killing one soldier and wounding three others. US officers said an unknown attacker threw a bag packed with explosives, which destroyed the lead vehicle and shook surrounding homes. The attacker was shot but managed to escape. Earlier that day, a US soldier had been killed and another wounded when their convoy was ambushed near the border with Syria. Military spokesman Lieutenant Colonel Scott Rutter of the 3rd Infantry Division sought to play down the incidents, saying: "Order in Baghdad is present. Any time you have a large group of civilians there's going to be some bad guys." Giving a boost to the coalition's efforts to root out the once all-pervasive Baath party, the Central Command said it had captured two more of those on its list of 55 most-wanted members of Saddam's ousted regime. Sayf al-Din al-Mashhadani, Baath Party regional chairman for the southern al-Muthanna province, and Saad Abdul Majid al-Faisal, Baath regional chairman for the Salahaddin province north of Baghdad, were captured Saturday. Meanwhile, another focus of tension emerged when the country's Shiite Muslim group blasted the US-led administration's decision to dissolve its military wing. Last week, Iraq's US administrator, Paul Bremer, ordered a ban on all heavy weapons in Iraq and required authorization to carry small arms. The decree effectively dissolved all militias, except those of the Kurdish factions in northern Iraq, which were exempted as members of the US-led war coalition. In New York, US Defense Secretary Donald Rumsfeld -- taking aim at Iran's ruling Shiite clerics -- said the United States will not permit interference in Iraq by its neighbors or their proxies. "Indeed, Iran should be on notice: Efforts to try to remake Iraq in Iran's image will be aggressively put down," he said. Tehran earlier decided to strip hundreds of thousands of Iraqis and Afghans in the country of their refugee status, with about 200,000 Iraqis to begin returning home early next week. **PHOTO CAPTION*** US troops patrol the city of Fallujah, 60 km (37 miles) northwest of Baghdad, where two US soldiers were killed in a second day of guerrilla attacks, marring the US-led administration's claim that post-war reconstruction is steaming ahead. (AFP/Karim Sahib)