Iraqi forces have broken through to the jihadist-besieged Shi'ite town of Amerli, where thousands of people have been trapped for more than two months with dwindling food and water supplies.
It is biggest offensive success for the Iraqi government since militants led by the Sunni Islamic State (IS) jihadist group overran large areas of five provinces in June, sweeping security forces aside.
The breakthrough on Sunday came as America carried out limited strikes outside north Iraq for the first time since its air campaign against militants began more than three weeks ago, and aircraft from several countries dropped humanitarian aid to Amerli.
The mainly Shi'ite Turkmen residents of the town in Salaheddin province were running desperately short of food and water, and were in danger both because of their Shi'ite faith, which jihadists consider heresy, and their resistance to the militants, which has drawn harsh retribution elsewhere.
"Our forces entered Amerli and broke the siege," Iraqi security spokesman Lieutenant General Qassem Atta told AFP, an account confirmed by a local official and a fighter from the town.
"It is a very important success," Atta later said on state television, adding that there was still fighting in the area.
The operation was launched on Saturday after days of preparations in which Iraqi security forces, Shi'ite militiamen and Kurdish fighters deployed for the assault and Iraqi aircraft carried out strikes against militants.
But the government's reliance on the thousands of Shi'ite militiamen involved in the operation poses serious dangers for Iraq, risking entrenching groups with a history of brutal sectarian killings.
The United States announced that it carried out three air strikes in the Amerli area, expanding its air campaign outside the far north for the first time, while Australian, British, French and US aircraft dropped relief supplies for the town.
"At the request of the government of Iraq, the United States military today airdropped humanitarian aid to the town of Amerli," said Pentagon spokesman Rear Admiral John Kirby.
"The United States Air Force delivered this aid alongside aircraft from Australia, France and the United Kingdom, who also dropped much needed supplies."
The aid drops came alongside "coordinated air strikes against nearby (IS) terrorists in order to support this humanitarian assistance operation," he added.
"The operations will be limited in their scope and duration as necessary to address this emerging humanitarian crisis and protect the civilians trapped in Amerli," Kirby said.
US Central Command said the US supplies dropped included around 47,775 litres of drinking water and 7,000 pre-packaged meals.
Three US air strikes destroyed five IS vehicles and a checkpoint.
Western aid for Amerli was slow in coming, however, with the burden of flying supplies and launching strikes in the area largely falling to Iraq's fledging air forces.
"The US military will continue to assess the effectiveness of these operations and work with the Department of State, the US Agency for International Development, as well as international partners including the government of Iraq, the United Nations, and non-government organisations to provide humanitarian assistance in Iraq as needed," Kirby said.
The US military also launched air strikes Saturday on IS forces near Iraq's largest dam, north of the militant-held northern city of Mosul, the Pentagon said.
Kurdish forces retook the dam after briefly losing it to the jihadists earlier this month, securing the source of much of the power and irrigation water for the region around Iraq's second city.
The jihadist Islamic State and its allies control swathes of both northern and western Iraq and neighbouring northeastern Syria where their rule has witnessed a spate of atrocities that have shocked the world.
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