US and allies intensify air strikes against Islamic State Militants in Syria.

New air strikes have hit Islamic State militants in Syria, hitting targets close to the border with Turkey.

Witnesses say they saw two military aircraft approaching from Turkey but Turkish officials denied its airspace or bases were used in the attack.

The US-led coalition expanded its raids against IS into Syria. But the aerial bombardment near the Kurdish town of Kobane has not been confirmed by the US or another coalition partner.

Turkish military sources said neither its air force nor the US airbase at Incirlik in southern Turkey had been used.

BBC