A growing number of opposition groups in Syria are getting increased weapons and ammunition supplies from the US Air Force to tackle Islamic State, according to US media reports citing the country’s military.

The weapons are intended for opposition forces closing in on IS's self-proclaimed capital Raqqa in Syria, USA Today reports.

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The “expanded” airdrops are “helping ground forces take the offensive to [the Islamic State] and efforts to retake Raqqa,” Gen. Carlton Everhart, commander of the US Air Mobility Command, is quoted by the news outlet.

Currently, the Syrian Democratic Force (SDF) - an alliance of various militias, mainly formed by Kurdish fighters – is continuing its push to retake territories around Raqqa. SDF is among key opposition forces being backed by the US-led international coalition in Syria.

The weapons supplies “are absolutely essential” for the irregular forces fighting on the ground, the US Air Force spokesman in Baghdad Col. John Dorrian claimed, according to USA Today.

Meanwhile, Everhart reportedly claimed that the US military is being extremely precise while delivering arms and equipment to the opposition in Syria. "We'll get it within 10 or 15 meters of the mark," he said.

The US-led coalition has been repeatedly conducting military airdrops for the opposition groups in Syria. However, such missions have not always gone according to plan.

Back in October 2014, a weapons airdrop by the US Air Force apparently ended up in the hands of IS terrorists, who released a video claiming to have seized the cache of arms. The weapons had been intened for the Kurdish forces battling jihadists who were besieging the Syrian town of Kobane at the time.

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Pentagon spokesman Col. Steven Warren later said that two bundles of weapons have been lost. While one of them was destroyed by an air strike, another “went astray and probably fell into enemy hands."

"There is always going to be some margin of error in these types of operations,” Warren added.

In December last year, US President Barack Obama granted a waiver for some of the restrictions on the delivery of military aid to “foreign forces, irregular forces, groups, or individuals,” if those groups are supporting the US's alleged counter-terrorism efforts in Syria.

Reacting to the decision, Russian presidential spokesman Dmitry Peskov said the move could result in some of the weapons getting into the hands of terrorists.

Such an occurence would pose “a serious threat not only for the region, but the entire world,” he warned.

On December 9, 2016 US Democratic lawmaker Tulsi Gabbard introduced the Stop Arming Terrorists Act bill. She alleged that the CIA in fact supplied arms to the opposition, some of whom cooperated with terrorists including al-Qaeda. “This madness must end,” she urged.