BEIRUT — Hard-line Islamic rebels captured a small town in northwestern Syria near the Turkish border as part of their offensive in the rugged coastal region that is a bastion of support for President Bashar Assad, activists said Monday.
Fighters from an array of armed opposition groups seized the predominantly Armenian Christian town of Kassab on Sunday. The rebels, including militants from the Al Qaeda-affiliated Nusra Front, have also wrested control of a nearby border crossing to Turkey.
The advances, while minor in terms of territory, provided a boost to a beleaguered rebellion that has suffered a string of battlefield losses in recent weeks. Forces loyal to Assad have captured several towns near Syria’s border with Lebanon as part of a government drive to sever rebel supply lines across the porous frontier.
Rebels launched their offensive on Friday in Latakia province, which is the ancestral home of the Assad family and a stronghold of his minority Alawite sect, the Shi’ite offshoot community that is a main pillar of support for his rule. Since then, the fighting has focused around Kassab and the nearby border crossing.
Rami Abdurrahman, the director of the Britain-based Syrian Observatory for Human Rights, said rebels were in control of the center of Kassab on Monday but that clashes were raging in the hills outside of town.
Government warplanes were conducting airstrikes on several positions in the area, including Nabeh al-Murr and the scattering of homes and fields surrounding Kassab, the Observatory said. There was no immediate word on casualties.
A Syrian state reporter speaking on TV from outside Kassab Monday said the government had captured several Nusra Front fighters, and that the army is determined to take back the ground it has ceded.
Damascus says the rebels entered Syria from Turkey, and has accused Ankara of pursuing ‘‘aggressive policies’’ toward Syria. On Sunday, Turkey’s military said it shot down a Syrian MiG-23 after it entered Turkey’s airspace. Syria says the jet was flying over Syrian territory when it was hit.
Turkey, a NATO member, is one of the main backers of the three-year-old rebellion against Assad. Ankara allows rebels to use Turkish territory as a logistical and support base, and weapons and fighters move fairly freely across the border into opposition-held parts of northern Syria.
The ongoing rebel offensive in Latakia is not the opposition’s first significant incursion in the province.
Last August, a mix of moderate and extremist rebel brigades captured around a dozen villages in the Latakia mountains, before a government counteroffensive expelled them.
Afterward, Human Rights Watch said nearly 200 civilians, including children, the elderly and the handicapped, were killed in the attack. It said rebel abuses during the operation amounted to war crimes.
Syria’s conflict has killed more than 140,000 people, forced more than 2 million people to seek refuge abroad, and triggered a massive humanitarian crisis across the region.
The UN Security Council last month demanded immediate access everywhere in Syria to deliver humanitarian aid to millions of people in need. It also called for an end to sieges of populated areas, and a halt to all attacks against civilians, including indiscriminate shelling and aerial attacks using barrel bombs in populated areas.
Barrel bombs are makeshift devices packed with hundreds of pounds of explosives as well as scraps of metal. Pushed out of the back of helicopters, the crude weapons cause massive damage on impact.
Human Rights Watch also called on the Security Council to impose an arms embargo on Syria, including on the purchase or servicing of helicopters.