The capture of the town of Al-Mabroukah by the YPG militia opens the road for its forces to advance towards the Islamic State's stronghold in Raqqa province, the Syrian Observatory for Human Rights reported.

While losing ground in the northeast, Islamic State has launched a new offensive in central Syria, where it has seized wide areas from the Damascus government including the ancient city of Palmyra, also known as Tadmur.

The YPG, supported by US-led air strikes, have been making steady gains this month against Islamic State in the northeast, which is important in the battle against the jihadists due to its location bordering territory held by the group in Iraq.

The Syrian military has also captured territory from Islamic State in the same region, the Observatory says. The Observatory said the YPG had seized control of 4,000 square kilometres in this month's advance.

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