Turkish soldier on an armoured personnel carrier watches as in the background a flag of the Kurdish People’s Protection Units, or YPG, is raised over the city of Tal Abyad, Syria, Tuesday, June 16, 2015.

Turkey says that US-backed Kurdish militia in Syria are providing arms to Kurdish rebels fighting Ankara, citing as evidence a joint US- and Swedish-made anti-tank rocket reportedly seized from the rebels.

Turkey considers the Kurdish People’s Protection Units, or YPG, an extension of the outlawed Kurdistan Workers’ Party, or PKK, and views it as a terrorist organization.

The Syrian Kurdish force, however, is a US ally in the fight against the ISIS group.

Turkish Prime Minister Binali Yildirim said Wednesday that the rocket seized during anti-PKK operations near the Syrian border showed that the YPG was transferring US-provided arms to the PKK.

Pentagon spokesman Chris Sherwood said the weapons aren’t meant for the PKK, and the US doesn’t know that any of the arms have gone to the group.

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