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At least 32 Islamic State group [IS] fighters were killed on Sunday in apparent US-led coalition airstrikes on the group's Syrian stronghold of Raqqa province, a monitor said.

Rami Abdel Rahman, head of the Syrian Observatory for Human Rights, said that more than 40 IS militants were also wounded "in a series of around 15 strikes on IS bases by planes believed to be from the US-led coalition".

He said the wave of raids hit IS bases to the north, east and southeast of Raqqa city, which is the group's de facto Syrian headquarters.

Abdel Rahman said the casualty figures were collected from a single hospital and the final toll from the airstrikes could rise.

The US-led coalition has been carrying out strikes against IS in Syria since last September, expanding a campaign that began with raids in neighbouring Iraq.

IS controls large stretches of territory in the two countries, which it describes as an Islamic "caliphate".

The US-led coalition has expanded its operations in recent days, partly in response to the deadly attacks in Paris claimed by IS.

Britain voted on Wednesday to join the coalition's strikes in Syria, after a heated debate in the country's parliament and with the staunch backing of Prime Minister David Cameron.

And German lawmakers on Friday approved plans to join the military action against the group in Syria.

Raqqa is frequently the target of airstrikes by the US-led coalition, as well as the Syrian air force and Russian warplanes, which began an air campaign in Syria in late September.