In a bid to repel Islamic State (IS) militants attacking the Syria-Turkey border town of Kobane, the US-led coalition carried out more air strikes, the BBC reported Tuesday.
It is believed if IS captures Kobane, its jihadists will be able to control a long stretch of the Syrian-Turkish border.
A BBC correspondent claimed to have heard three raids in 30 minutes - and eight in total - Tuesday, in support of Syrian Kurds.
However, Turkish President Recep Tayyip Erdogan warned air strikes were not enough and Kobane was "about to fall".
At least 400 people have been killed in three weeks of fighting for Kobane, monitors say, and 160,000 Syrians have fled.
In its latest media release, the US military confirmed five airstrikes around Kobane, saying they were carried Monday and Tuesday, but did not specify exactly when.
It said the attacks had destroyed four IS armed vehicles and an "IS unit", and damaged one IS tank and one armoured vehicle.
