WATCH ABOVE: Several explosions sent plumes of white smoke into the air above the Syrian town of Kobani on Saturday. The strategic border town has been under siege by Islamic State militants since mid-September.

BEIRUT – Kurdish fighters advanced on the Islamic State extremist group in Iraq and Syria on Saturday, pushing into the contested, refugee-packed Sinjar mountains and gaining ground in the embattled Syrian border town of Kobani after heavy clashes, Kurdish officials and an activist group said.

In Syria, Kurdish Democratic Union Party spokesman Nawaf Khalil said Kurdish fighters advanced in six neighbourhoods and have besieged the IS-held cultural centre east of Kobani. He added that Kurdish fighters captured the Yarmouk school, southeast of Kobani where eight bodies of IS fighters were found.

The Britain-based Syrian Observatory for Human Rights said the main Syrian Kurdish force known as the People’s Protection Units, or YPG, killed 10 IS fighters.

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The IS group began its Kobani offensive in mid-September, capturing parts of the town as well as dozens of nearby villages. Hundreds of fighters on both sides have been killed since. Kurdish forces have gradually pushed the extremist group back in recent weeks with the help of U.S.-led coalition airstrikes.

The push in Kobani came a day after YPG fighters opened a corridor between their positions in northeastern Syria and Mount Sinjar in neighbouring Iraq where Iraqi peshmerga fighters have been on the offensive as well. Earlier this week, Iraqi peshmerga fighters were also able to open another corridor to Mount Sinjar.

Iraq’s Kurdistan Region Security Council said peshmerga fighters launched a new offensive on Saturday toward Mount Sinjar and were able to capture the nearby area of Mushrefa.

The statement said that early Saturday, 32 truckloads of food, water and other aid departed from the northern Iraqi city of Erbil to Mount Sinjar through the “corridor established by the courageous Peshmerga forces.”

Warplanes from the U.S.-led coalition circled overhead as peshmerga troops returning from the front said the city was full of roadside bombs and snipers. The peshmerga had set up a base overlooking the city on the summit of Mount Sinjar, which included a makeshift hospital, they added.

Spokesman Jabbar Yawar said Peshmerga fighters were fighting their way into Sinjar and nearby areas in co-ordination with allied air support.

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The Islamic State group captured almost a third of Iraq and Syria earlier this year, plunging the region into deep crisis.

In early August, the militants captured Iraqi towns of Sinjar and Zumar, prompting tens of thousands of people from the Yazidi minority to flee to the mountain, where they became trapped. Many were eventually airlifted by a passageway through Syria back into Iraq, where they found refuge in Iraq’s northern Kurdish semi-autonomous region.

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With reporting by Dalton Bennett in Sinjar.