Iraq conflict: US in new air strikes on militants
The US military says it has carried out a third round of air strikes on Sunni Muslim militants to defend civilians in northern Iraq.
It said jet fighters and drones had destroyed armoured vehicles that were firing on members of the Yazidi sect trapped by jihadists on Mount Sinjar.
The US authorised the strikes last week to halt the lightning advance of Islamic State (IS) in Iraq.
France's foreign minister has arrived in Iraq to discuss the crisis.
Laurent Fabius, who landed in the capital Baghdad on Sunday morning, will also oversee the first delivery of French aid for displaced people in the Sinjar region.
He is due to later travel to the Kurdish city of Irbil, which is being threatened by the jihadists.
Meanwhile, a British military aircraft has made its first airdrop of humanitarian aid in northern Iraq, confirms the UK Ministry of Defence.
IS (formerly known as Isis) has taken control of large swathes of Iraq and Syria in recent months, declaring a "caliphate", or Islamic state, in the region.
A US military statement said Sunday's raids had been aimed at defending members of the Yazidi religious group who were being "indiscriminately attacked" by IS militants near Sinjar.
IS overran the town of Sinjar last week, prompting thousands of Yazidis to flee.
The Pentagon also said a third US air-drop of food and water had been made on Saturday night to refugees on Mount Sinjar.
The UN children's agency, Unicef, warned that at least 56 Yazidi children had died of dehydration in the mountains around Sinjar.
UK officials estimated on Saturday that between 50,000 and 150,000 people could be trapped there.
A Syrian official told AP news agency that more than 20,000 starving Yazidis had fled across the border.
He said columns of refugees were running a gauntlet of gunfire through a tenuous "safe passage" being defended by forces of Iraq's autonomous Kurdistan Region.
Amnesty International adviser Donatella Rovera told the BBC that thousands of those trapped on the north side of the mountains had managed to escape, but added: "The most acute situation is for those on the southern side. They cannot get to the safe passage that has been opened."
Call for Iraqi unity
IS seized Qaraqosh, referred to as Iraq's Christian capital, last week. The militants have also captured Mosul dam - the country's largest - where they have hoisted their black flags and are patrolling its perimeter.
On Saturday, President Obama warned it was "going to take some time" to help Iraqis overcome the jihadist-led rebellion and stabilise their country.
It is the first time US forces have been directly involved in a military operation in Iraq since they withdrew from the country in late 2011.
The US has been pressing Iraq's leaders to form a unity government to help tackle the threat from jihadists.
Iraqi politicians have been unable to form a government since April's parliamentary elections, which were won by Prime Minister Nouri Maliki's State of Law Coalition.
- The majority are Chaldeans, part of the Catholic Church
- Numbers have fallen from around 1.5 million since the US-led invasion in 2003 to 350,000-450,000
- In Nineveh province, they live mainly in towns such as Qaraqosh (also known as Baghdida), Bartella, al-Hamdaniya and Tel Kef
- Secretive group whose origins and ethnicity are subject to continuing debate
- Religion incorporates elements of many faiths, including Zoroastrianism
- Many Muslims and other groups view Yazidis as devil worshippers
- There are estimated to be around 500,000 Yazidis worldwide, most living in Iraq's Nineveh plains