By Jonathan MarcusBBC diplomatic correspondent
Ethnic Kurds have been protesting on border towns to Syria in Turkey against the IS assault on Kobane
Fighters from the so-called Islamic state (IS) have reportedly entered the eastern part of the Kurdish town of Kobane.
They have effectively surrounded the town - which sits hard up against the Syrian-Turkish border - from three sides and are firing into it from higher ground.
If Kobane falls it will be a serious set-back for the Kurds. But it will inevitably also raise fundamental questions about the scope and capacity of the US air campaign to combat IS, and about the diverse goals of the anti-IS coalition that the US has assembled.
Kobane, which is a small salient of land poking into Syrian territory, is in no sense an easy place to defend.
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