Seven targets were hit in Syria on Saturday, the Pentagon said, including an IS building and two armed vehicles at the border crossing in the besieged Kurdish town of Ain al-Arab, also known as Kobane.
The Syrian Observatory for Human Rights monitoring group said IS rockets also hit the town, for the first time since the jihadist assault began on September 16, wounding 12 people.
The jihadist advance on the town has sent 160,000 refugees streaming into Turkey.
Other targets in Syria included IS vehicles and buildings near Al-Hasakeh, as well as an IS command and control facility near Minbej, US Central Command said.
Meanwhile, Royal Air Force Tornado GR4 combat jets armed with laser-guided bombs took off from Britain's RAF Akrotiri base on Cyprus for missions over Iraq but returned after seven hours without having used their weapons.
"On this occasion no targets were identified as requiring immediate air attack by our aircraft," a defence ministry spokesman in London said.
Belgium and Denmark have also approved plans to join France and the Netherlands in launching air raids against the militants in Iraq, allowing Washington to focus on the more complex operation in Syria, where IS is based.
Turkish President Recep Tayyip Erdogan said on Saturday Turkey could take a military role in the coalition and his government would go to parliament with a motion on October 2.
Ankara has for months frustrated the West with its low-key role in the anti-IS campaign but insisted its hands were tied because of dozens of Turkish hostages abducted by IS in Iraq, who are now free.
Senior Syrian Kurdish official Newaf Khalil told AFP the latest strikes hit the IS-held town of Ali Shar, east of Ain al-Arab, and destroyed several IS tanks.
Coalition aircraft also pounded the Euphrates valley city of Raqa, which the jihadists have made the headquarters of the "caliphate" they declared in June straddling swathes of Iraq and Syria.
A US defence official has said the Syrian mission is now similar to US-led air raids against IS in Iraq, with "near continuous" combat sorties.
Washington is also planning to train and arm 5,000 Syrian rebels as part of the effort, although the top US military officer, General Martin Dempsey, said between 12,000 and 15,000 men would be required to recapture "lost territory" in Syria.
European governments have so far ruled out launching strikes in Syria, although Britain "reserved the right" to intervene there in case of an imminent "humanitarian catastrophe".
Washington has instead been supported in its Syria campaign by Arab allies Bahrain, Jordan, Qatar, Saudi Arabia and the United Arab Emirates.
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