The US has airdropped weapons and supplies for Kurdish forces fighting Islamic State (IS) in the town of Kobani in Syria.

A statement from US Central Command said Air Force C-130 planes "delivered weapons, ammunition and medical supplies that were provided by Kurdish authorities in Iraq and intended to enable continued resistance against ISIL's (IS) attempts to overtake Kobani".

Multiple airdrops were completed near the town, which is close to the border with Turkey and would be seen as a strategic coup for IS.

Kurdish forces said they had received a "large quantity of ammunition" from the US airdrop.

The statement said 135 US airstrikes near Kobani - combined with continued resistance on the ground - had slowed IS advances and killed hundreds of its fighters.

"However, the security situation in Kobani remains fragile as ISIL continues to threaten the city and Kurdish forces continue to resist," the statement added.

The Kurds have been under IS assault for more than a month - and US Commander General Lloyd Austin has warned that the city could fall.

However, airdrops are likely to anger key ally Turkey, which has said it would oppose the US helping to arm Kurdish rebels.