Activists said Kurdish fighters thwarted a bid by Islamic State (IS) militants to advance into the center of the embattled Syrian town of Kobani early on October 11.
The British-based Syrian Observatory for Human Rights said the attack came after IS militants overran Kurdish headquarters in the border town a day earlier.
The monitoring group said the IS assault sparked 90 minutes of heavy fighting with Kobani's Kurdish defenders before the militants fell back.
U.S.-led coalition warplanes also carried out two air strikes on IS targets south and east of Kobani early on October 11, the group said.
The group said on October 10 that IS militants had taken "at least 40 percent" of Kobani.
In Geneva, UN envoy Staffan de Mistura warned if Kobani were to fall to IS militants, those remaining there "will be most likely massacred."
He warned that Kobani could suffer the same fate as Srebrenica.
Some 8,000 Muslim boys were murdered by Serbs in that Bosnian town in 1995.