DEVELOPMENTS

— An Iraqi security official and eyewitnesses said a deadly gun battle near Kirkuk had broken out between two of the most powerful Sunni militant groups. The battle pitted the Islamic State of Iraq and the Levant, which is leading the battle with the Shiite-dominated government, against its Baathist allies and left 17 dead, according to the official.

— Security forces occupying Iraq’s largest oil refinery remained besieged by Islamist fighters as American and Kurdish officials warned the garrison probably could not hold out much longer unless relieved.

News services

Sunni insurgents led by an al-Qaida breakaway group expanded their offensive in a volatile western province Saturday, capturing three strategic towns and the first border crossing with Syria to fall on the Iraqi side.

It’s the latest blow against Prime Minister Nouri al-Maliki, who is fighting calls that he be replaced even as forces beyond his control are pushing the country toward a sectarian showdown.

In a reflection of the bitter divide, thousands of heavily armed Shiite militiamen — eager to take on the Sunni insurgents — marched through Iraqi cities Saturday in military-style parades on streets where many of them battled U.S. forces a half decade ago

The towns of Qaim, Rawah and Anah are the first territories seized in predominantly Sunni Anbar province, west of Baghdad, since fighters from the Islamic State of Iraq and the Levant group overran the city of Fallujah and parts of the provincial capital of Ramadi earlier this year.

The capture of Rawah on the Euphrates River and the nearby town of Anah appeared to be part of a march toward a key dam in the city of Haditha, which was built in 1986 and has a hydraulic power station that produces some 1,000 megawatts. Destruction of the dam would harm the country’s electrical grid and cause major flooding.

Iraqi military officials said more than 2,000 troops were dispatched to the site of the dam to protect it against a possible attack by the Sunni militants.

Rawah’s mayor, Hussein Ali al-Aujail, said the militants ransacked the town’s government offices and forced local army and police forces to pull out. Rawah and Anah had remained under government control since nearby Fallujah fell to the Sunni militants in January.

The Islamic State’s Sunni militants have carved out a large fiefdom along the Iraqi-Syrian border and have long traveled back and forth with ease, but control over crossings like the one in Qaim allows them to more easily move weapons and heavy equipment to different battlefields. Syrian rebels already have seized the facilities on the Syrian side of the border and several other posts in areas under their control.

Police and army officials said Saturday that the Sunni insurgents seized Qaim and its crossing, about 200 miles west of Baghdad, after killing some 30 Iraqi troops in daylong clashes Friday.

The vast Anbar province stretches from the western edges of Baghdad all the way to Jordan and Syria to the northwest. The fighting in Anbar has disrupted use of the highway linking Baghdad with the Jordanian border, a key artery for goods and passengers.

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Al-Maliki’s Shiite-dominated government has struggled to push back against Islamic extremists and allied Sunni militants who have seized parts of the country’s north since taking control of the second-largest city of Mosul on June 10 as Iraqi government forces melted away.

The prime minister, who has led the country since 2006, also has increasingly turned to Iranian-backed Shiite militias and Shiite volunteers to bolster his beleaguered security forces.

The parades in Baghdad and other mainly cities in the mainly Shiite south revealed the depth and diversity of the militia’s arsenal, from field artillery and missiles to multiple rocket launchers and heavy machine guns, adding to mounting evidence that Iraq is inching closer to a religious war between Sunnis and Shiites.