CIA-coordinated military aid for rebels in northwest Syria has been frozen since they came under major attack last month by radical Islamic militants, rebel sources said, raising doubts about foreign support key to their war against President Bashar al-Assad.

Rebel officials said that no official explanation had been given for the move this month following the jihadist assault, though several said they believed the main objective was to prevent arms and cash falling into Islamist militant hands. But they said they expected the aid freeze to be temporary.

The halt in assistance, which has included salaries, training, ammunition and in some cases guided anti-tank missiles, is a response to jihadist attacks and has nothing to do with U.S. President Donald Trump replacing Barack Obama in January, two U.S. officials familiar with the CIA-led program said.

The freeze reflects the troubles facing Free Syrian Army (FSA) rebels in the almost six-year-old revolt against Assad, who now appears militarily unassailable in his core western region largely thanks to direct intervention on his side by Russia and Iran.

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