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Shi’ite fighters, who have joined the Iraqi army to fight against militants of the Islamic State, formerly known as the Islamic State of Iraq and the Levant (ISIL), take part in field training in the desert in the province of Najaf, September 16, 2014. Image Credit: Reuters

Beirut: Isil has won new recruits in Syria since President Barack Obama signalled last week that air strikes against the group will be expanded from Iraq to its strongholds in northern and eastern Syria, a group monitoring the war said on Wednesday.

The Syrian Observatory for Human Rights said 162 people had joined Isil training camps in Aleppo province since September 10, when Obama said he would not hesitate to strike Isil in Syria.

The new recruits do not represent a big increase in the size of Isil, which is estimated by intelligence agencies at 20,000 to 30,000 fighters in Syria and Iraq. But they do illustrate the risk that US-led efforts to crush Isil will end up winning it more followers.

Isil’s main Syrian bases are in the northern and eastern provinces of Raqqa and Deir Al Zor, which borders Iraq.

The group moved west into Aleppo in August, seizing territory from other insurgents and occupying strategic hilltops, said Rami Abdul Rahman, who runs the Observatory. Isil’s new recruits joined two of its training camps in the area.

Abdul Rahman, whose organisation gathers information from all sides in the Syrian conflict, estimates the group now has more than 50,000 fighters in Syria alone.

Four of the new recruits were Australian nationals and 15 of them non-Syrian Arabs who crossed from Turkey, the Observatory said. The rest were Syrians, most of them formerly fighters with the Nusra Front, Al Qaida’s official affiliate in the Syrian war and a rival of Isil.

Obama declared his plans to establish a broad coalition against Isil last week. World powers meeting in Paris on Monday gave public backing to military action to fight the group in Iraq.

Al Qaida in the Arabian Peninsula and Al Qaida in the Islamic Maghreb have both urged rival Islamist groups in Iraq and Syria to stop fighting each other and unite against the US-led alliance preparing to attack.