French air strikes in Syria have probably killed French jihadists, a source in the delegation of Prime Minister Manuel Valls said on Monday during a visit to neighboring Jordan.

"The strikes have killed jihadists. There might well be French jihadists among them," the source told AFP.

The source said he could not confirm a figure of six French jihadists killed which he said probably came from a Syrian non-governmental.

Previous reports indicated that French citizens had been killed, but their status was not clear at the time.

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