Fresh US-led strikes hit the so-called ’Islamic State of Iraq and the Levant’ (ISIL) terrorist group targets in Syria overnight, both in its Raqa province stronghold and in Aleppo province further west.

Fresh US-led strikes hit the so-called 'Islamic State of Iraq and the Levant' (ISIL) terrorist group targets in Syria overnight, both in its Raqa province stronghold and in Aleppo province further west, a monitoring group said on Monday.

In Aleppo province, three strikes hit targets around the ISIL-held town of Minbej, including a complex of grain silos and a mill, the UK-based opposition Observatory for Human Rights said.

The strikes also hit a local IS headquarters between Minbej and the town of Jarabulus further north.

In Raqa province, strikes hit the outskirts of Raqa city, the de facto headquarters of ISIL in Syria, hitting at least one checkpoint belonging to the group.

The coalition also carried out strikes around the town of Tal Abyad, on the border with Turkey, hitting a school being used as a local headquarters by ISIL militants, the Observatory said.

The latest strikes came after the coalition struck the entrance of the country's main gas plant in the eastern city of Deir Ezzor in an apparent warning to ISIL militants to abandon the facility.

The plant is the largest in Syria and feeds a key power station in regime-held Homs province.

US warplanes began strikes against ISIL and other terrorist groups targets in Syria last Tuesday with the support of Arab allies, expanding an air campaign that Washington began in Iraq on August 8.