A group of U.S.-trained rebels that recently returned to Syria said that it has defected and handed over his weapons to al-Qaida affiliate in the country.

Syrian rebels trained by the United States gave some of their equipment to the al Qaeda-linked Nusra Front in exchange for safe passage, a U.S. military spokesman said on Friday, the latest blow to a troubled U.S. effort to train local partners to fight ISIS militants.

The rebels surrendered six pick-up trucks and some ammunition, or about one-quarter of their issued equipment, to a suspected Nusra intermediary on Sept. 21-22 in exchange for safe passage, said Colonel Patrick Ryder, a spokesman for U.S. Central Command, in a statement.

“If accurate, the report of NSF members providing equipment to al Nusra Front is very concerning and a violation of Syria train and equip program guidelines,” Ryder said, using an acronym for the rebels, called the New Syrian Forces.

U.S. Central Command, which oversees U.S. military operations in the Middle East, was told of the equipment surrender around 1 p.m. (1700 GMT) on Friday, Ryder said. Earlier on Friday, Ryder had said all weapons and equipment issued to the rebels remained under their control.

The news was the most recent sign of trouble in a fledgling military effort to train fighters to take on the ISIS militant group in Syria, where a 4-1/2-year civil war has killed about 250,000 people and caused nearly half of Syria’s prewar population of 23 million to flee.

A top U.S. general told Congress last week that only a handful of the rebels are still fighting in Syria, though U.S. military officials said this week that dozens more have since joined them.

U.S. officials have told Reuters that a review is underway that could result in scaling back and reenvisioning the program.

Syrian rebels trained by the United States gave some of their equipment to the al Qaeda-linked Nusra Front in exchange for safe passage, a U.S. military spokesman said on Friday, the latest blow to a troubled U.S. effort to train local partners to fight ISIS militants.

The rebels surrendered six pick-up trucks and some ammunition, or about one-quarter of their issued equipment, to a suspected Nusra intermediary on Sept. 21-22 in exchange for safe passage, said Colonel Patrick Ryder, a spokesman for U.S. Central Command, in a statement.

“If accurate, the report of NSF members providing equipment to al Nusra Front is very concerning and a violation of Syria train and equip program guidelines,” Ryder said, using an acronym for the rebels, called the New Syrian Forces.

U.S. Central Command, which oversees U.S. military operations in the Middle East, was told of the equipment surrender around 1 p.m. (1700 GMT) on Friday, Ryder said. Earlier on Friday, Ryder had said all weapons and equipment issued to the rebels remained under their control.

The news was the most recent sign of trouble in a fledgling military effort to train fighters to take on the ISIS militant group in Syria, where a 4-1/2-year civil war has killed about 250,000 people and caused nearly half of Syria’s prewar population of 23 million to flee.

A top U.S. general told Congress last week that only a handful of the rebels are still fighting in Syria, though U.S. military officials said this week that dozens more have since joined them.

U.S. officials have told Reuters that a review is underway that could result in scaling back and reenvisioning the program.

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