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ANKARA - Artillery fire from Turkey and coalition air strikes killed 23 Islamic State militants in northern Syria, broadcaster Haberturk reported on Monday.

Haberturk said a total of 33 strikes targeted militants thought to be preparing an attack on Turkey. It did not say when the operation was carried out. The US-led coalition has stepped up air strikes against Islamic State positions in the area in recent weeks, in response to rocket attacks by the militants on the border town of Kilis.

Kilis, just across the frontier from an Islamic State-controlled region of Syria, has been hit by rockets more than 70 times this year. More than 20 people have been killed and parts of the town reduced to rubble.

Meanwhile, the Islamic State group launched a surprise assault Monday near its besieged stronghold in northern Syria, killing residents of two villages it recaptured from US-backed fighters, a monitor said.

The Syrian Observatory for Human Rights said IS had dispatched a small group of militants - including one driving an explosives-laden car - into villages southeast of their bastion of Manbij.

The villages had been seized in recent weeks by the US-backed Syrian Democratic Forces in their push for Manbij.

"IS is trying to defend Manbij by sending fighters from outside the town to attack the SDF in these villages," said Rami Abdel Rahman, the director of the Britain-based Observatory. "Daesh executed residents," he added, using an Arabic acronym for IS.

The head of the Observatory, which relies on a vast network of sources on the ground for its information, did not have an immediate toll from the villages.

The US-led coalition backing the SDF carried out a barrage of air strikes on Monday to defend the villages, said Abdel Rahman. At least four SDF fighters were killed in the clashes and many more were wounded.

The SDF - a Kurdish-Arab alliance with air support from the US-led coalition - encircled Manbij nearly 10 days ago.

But since then, they have been slowed by almost daily suicide bombings as IS puts up a fight for the town.

Held by the militants since 2014, Manbij was a key stop along IS's supply route from the Turkish border southeast through the town of Tabqa and on to its de facto Syrian capital of Raqa.

IS is also mounting a fierce defence of Tabqa, which has been under attack by Russia-backed regime forces since early June. On Monday, the Observatory said, a failed IS counterattack against regime fighters southwest of Tabqa killed at least 14 militants and six government loyalists. "IS dispatched 300 fighters from Raqa to Tabqa to help defend the town," Abdel Rahman said.

Syria's civil war began with the brutal repression of anti-government demonstrations in 2011 and has now killed more than 280,000 people and displaced millions.