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Rebel fighters stand guard at a former base used by fighters from Daesh (Islamic State in Iraq and the Levant), after they captured it from the ISIL in al-Dana town in Idlib province January 9, 2014. Image Credit: REUTERS

Beirut: Fighting between an Al Qaida-linked group and a loose alliance of more moderate and ultraconservative rebel brigades has killed nearly 500 people over the past week in northern Syria, an activist group said Friday.

The rebel-on-rebel violence that broke out a week ago has spread across four provinces in opposition-held parts of the north in what amounts to the most serious infighting among opponents of President Bashar Al Assad since the country’s conflict began in March 2011.

The clashes pit fighters from a variety of Islamist and moderate factions against the Islamic State of Iraq and the Levant (Isil), an extremist group that has alienated many Syrians over the past several months by using brutal tactics to implement its strict interpretation of Islamic law.

The Britain-based Syrian Observatory for Human Rights said Friday that at least 482 people have been killed in the fighting. It said 240 of the dead were rebel fighters, while another 157 were from the “Islamic State”. The remaining 85 were civilians, the Observatory said.

The consortium of ultraconservative rebels and more moderate brigades have made headway against fighters from the “Islamic State” in several areas of the provinces of Aleppo, Idlib, Hama and Raqqa — although the Al Qaida-linked group has managed to regroup and curb some of its losses.

Isil and another Al Qaida linked group known as Jabhat Al Nusra, or the Nusra Front, initially joined forces with moderate rebels fighting to oust Al Assad in a conflict that began as a popular uprising but morphed into a civil war.

The extremists proved well-organised and efficient fighters, giving the ragtag rebels a boost.

But the brutality of the “Islamic State” has turned other factions against it, leading to some of the worst infighting of the conflict.

Activists said on Friday that jihadists had made advances on rebel fighters in the battle for Raqa, in northern Syria, but were on the back foot in parts of Aleppo and Idlib.

“In Idlib and Aleppo provinces, the [rebel] Free Syrian Army is advancing, but in Raqa the Isil is winning because its supply routes [to Iraq] are open there,” said Alaaeddine, an Aleppo-based activist.

“In Idlib there are practically no Isil bases left, as is the case in Aleppo city and the west of the province [on the border with Turkey],” he said.

But in Raqa, which came under Isil’s control soon after President Bashar Al Assad’s regime lost control of the provincial capital, “Isil seized the Mashlab district and an Al Nusra Front base” on Thursday night, said the Syrian Observatory for Human Rights.