Iraq's prime minister on Thursday dismissed a Kurdish proposal to freeze the results of last month's independence vote, as Iraqi government forces and Kurdish fighters traded fire near the border with Turkey.
Haider Abadi's office released the comments as he met with Iran's supreme leader and other officials in Tehran. Both Iran and neighboring Turkey opposed the referendum, and have sided with Baghdad in the escalating dispute.
Iraq's central government "will accept only the canceling of the referendum and following the constitution," Abadi said in the statement, rebuffing what appeared to be an attempt by Kurdish leaders to save face.
More than 90% voted in favor of independence from Iraq in last month's nonbinding referendum, which Kurdish leaders had billed as an opening bid in negotiations with Baghdad over expanded autonomy.
Instead, federal forces responded by retaking Kirkuk and other disputed areas outside the Kurds' autonomous region. Most Kurdish forces have withdrawn without a fight, but scattered clashes have broken out, pitting two close U.S. allies against each other.
Iraq's Kurdish regional government on Thursday accused Iraqi forces of "launching an offensive" against Kurdish forces along the border with Turkey.
"This is a blatant violation of the Iraqi constitution, which forbids the use of the army to settle political disputes. We condemn Iraq's military aggression in the strongest terms," the Kurdistan Region Security Council said.
Ahmed Asadi, a spokesman for the mostly Shiite state-sanctioned militias known as the Popular Mobilization Forces, said Kurdish troops opened fire on federal forces as they moved toward the border. He said the clashes caused no casualties.
The U.S. is closely allied with both the Iraqi military and Kurdish forces, which together have driven Islamic State from most of the country. But the top U.S. general in Iraq warned this week that the battle against the extremists is not yet over, and said the dispute with the Kurds has diverted precious resources.
"We don't need Iraqis killing Iraqis when we've got Daesh to kill out in the west," said Lt. Gen. Paul Funk, the commander of the U.S.-led coalition against Islamic State. Daesh is the Arabic acronym for the group, which still holds territory straddling Iraq's western border with Syria.