The American military for the first time has airdropped weapons, ammunition and medical supplies to Syrian Kurds in the battleground city of Kobane, in a move likely to anger key ally Turkey.
Kurdish defenders have been under IS assault for more than a month in Kobane, which has become a key prize and is being fought under the gaze of the world media massed just across the border in Turkey.
Three C-130 cargo aircraft carried out what US Central Command (CENTCOM) called "multiple" successful airdrops of supplies in the vicinity of Kobane, including small-arms weapons, provided by Kurdish authorities in Iraq.
The aircraft faced no resistance from the air or the ground, were not accompanied by fighter jets and exited the area safely, a senior Obama administration official said, refusing to rule out a repeat of the action if needed, possibly in the near future.
The supplies were "intended to enable continued resistance against (IS's) attempts to overtake Kobane," CENTCOM said in a statement.
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One senior Obama administration official said Kurdish fighters had put up an "impressive" effort in the face of an emboldened IS, but cautioned that Kobane could still fall to the IS and the security situation was "fluid."
Nevertheless, "hundreds" of IS fighters had been killed in the escalating campaign in Kobane.
Washington and its Western allies have been pressing Turkey to take a more direct role in taking on the IS group in Kobane, but Ankara is reluctant to arm Kurds and intervene militarily against the militants, fearing an effective fighting force from its historic foes on its border.
On the prickly subject of whether the Turkish government has been informed beforehand of the resupply drop, a senior administration official in Washington said President Barack Obama spoke to his counterpart Recep Tayyip Erdogan on Saturday "and was able to notify him of our intent to do this and importance we put on it".
The official added: "We understand the longstanding Turkish concern with the range of groups, including Kurdish groups, they have been engaged in conflict with and in peace talks with."
However, the official said, Islamic State was "a common enemy" for the United States and Turkey.
Washington had been in contact with Ankara in recent days to stress the "urgency" of the need to resupply Kurdish fighters in Kobane.
The airdrops were the fastest way to get supplies to Kurdish fighters, one senior administration official said, "and an opportunity to strike a blow against (IS). When we see an opportunity to target (IS) we will take them".
Separately, American-led warplanes launched 11 air strikes near Kobane on Saturday and Sunday, CENTCOM said, helping Kurdish fighters repulse a new IS attempt to cut their supply lines from Turkey.
So far, US forces have conducted more than 135 airstrikes against IS in Kobane alone.
