BAGHDAD, Iraq, June 17 A total of 44 people were killed Tuesday, in the U.S.-led coalition airstrikes and clashes between Iraqi forces and Islamic State (IS) militants in Iraq, security sources said.

In Iraq’s northern province of Nineveh, the coalition aircraft carried out an air strike at dawn on three vehicles carrying IS militants in Bara area near the IS-seized town of Sinjar, Luqman al-Khansouri, a leader in a Kurdish force, tasked with freeing Sinjar from IS, said.

“The airstrike resulted in destroying the three vehicles and the killing of 13 militants aboard,” Khansouri said.

In Salahudin province, fierce clashes erupted between the Iraqi forces and IS militants, on the main road leading to the IS-held town of Seiniyah, just west of the oil refinery town of Baiji, leaving at least 11 militants and six security members killed, a provincial security source said, on condition of anonymity.

On the road to Seiniyah, the security forces have been in heavy clashes with the IS militants for two successive days, as the troops and allied militias, known as Hashd Shaabi, or popular mobilisation, are trying to push forward to free the town, the source said.

Meanwhile, the security forces and IS militants continued tit-for-tat clashes in the town of Baiji and the nearby oil refinery, the source added.

Also in the province, at least 150 displaced families returned to their homes in the provincial capital city of Tikrit, some 170 km north of Baghdad, about two months after the security forces and Hashd Shaabi militias freed the city from the IS militants, the source said.

Since Mar 2, security forces, backed by thousands of allied Shiite and Sunni militias, have been involved in Iraq’s biggest offensive, to recapture the northern part of Salahudin province, including Tikrit and other key towns and villages, from IS militants.

In Anbar province, heavy clashes erupted between IS militants and a federal police force backed by Hashd Shaabi militiamen, near the militant-seized town of Garma, leaving nine policemen and militiamen killed and 15 others wounded, a provincial security source said.

In Iraq’s eastern province of Diyala, a roadside bomb detonated in the morning, near a female intermediate school in the town of Mkheisa, in the north-east of the provincial capital city of Baquba, some 65 km north-east of Baghdad, leaving a teacher and four students killed and six other students wounded, a provincial security source said.