The coalition did not give additional details on the captured fighters, saying only "a number of Daesh terrorists were detained in the engagement, including foreign terrorists".
Ammunition from China made up about 43 percent of what the research group recovered in Syria. Throughout Iraq and Syria, more than half of the ammunition the group recovered was Chinese or Russian.
Most of the weapons provided to anti-Assad rebels in Syria were purchased by the USA or Saudi Arabia from arms manufacturers in Eastern Europe, according to the auto report.
But, CAR also pointed out that the USA was responsible for manufacturing only a small percentage of weapons - 2 percent - recovered from ISIS in the region (Iraq and Syria). Furthermore, arms manufactured in Russian Federation and China accounted for more than half of the weapons and ammunition held by ISIS, according to the report.
"It means that there are not many intermediaries in this chain of custody", he explained.
The statement added that Islamic State militants have been moving freely through areas controlled by pro-Syrian regime forces.
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"It's less likely weapons provided by the Pentagon made it into the hands of ISIS, as that program started in response to ISIS' expansion and the Kurdish-dominated forces supported were not mixed alongside extremist elements", said Andrew Tabler, a senior fellow at the Washington Institute for Near East Policy.
A Defense Department spokesman, Eric Pahon, told NBC: "Any alleged misuse or diversion of USA support will be taken seriously and lead to the possible curtailment of support, if verified".
The CAR report sheds more light on the unintended consequences of the USA policy of arming rebel groups with ties to Sunni Islamic militants who were also fighting against the Syrian regime.
The covert weapons shipments to Syrian rebels, which President Donald Trump's administration cancelled earlier this year, are separate from publicly acknowledged USA support of the Syrian Democratic Forces (SDF).
"In particular, the impact of the group's acquisition of anti-armour weapons on its operational capacity is hard to quantify, but these weapons continue to pose a significant threat to coalition armoured forces", the group adds. More controversially, reports surfaced of the Free Syrian Army's providing support to assorted Islamic militant groups in Syria, including al-Qaida affiliate Jabhat al-Nusra.
The largest part of ammunition held by the group originated in three producer countries: China and Russia-in nearly equal proportions-and Romania.