|UN special envoy to Syria Staffan de Mistura updated reporters in Geneva|
on the latest from Kobane on Friday
Staffan de Mistura also urged Turkey to allow in volunteers to Syria to defend the town from Islamic State militants.
There are reports that IS has taken control of the Kurdish headquarters in the town, but this has been denied by a Syrian Kurdish official there.
Kobane has been a major battleground for IS and the Kurds for three weeks.
The fighting has forced hundreds of thousands of Syrians, mainly Kurds, to flee into neighbouring Turkey, which has so far ruled out any ground operation on its own against IS.
|Smoke rises after strikes from the US-led coalition|
Kurdish sources said four coalition air strikes hit the town in just 30 minutes
The US Central Command (Centcom) said that US fighter jets alongside UAE and Saudi Arabian military aircraft carried out fresh airstrikes on Thursday and Friday around the southeast of Kobane and in Deir al-Zour, in eastern Syria, destroying several IS vehicles and training facilities.
Kurdish sources inside Kobane told the BBC that four air strikes hit the western side of the town in one half-hour period.
Except for one narrow entry and exit point, Mr de Mistura said Kobane was "literally surrounded" by IS, with hundreds of mainly elderly civilians still inside the city centre and another 10-13,000 gathered nearby, AFP reports.
Wish I could explain what 'gathered nearby' means, but I can't. We don't know if those 10-13,000 people are at risk or not.
He said the civilians would "most likely be massacred'' if the town fell to IS, warning that the UN did not want to see another Srebrenica - where thousands of Muslim men and boys were killed by Bosnian Serb forces in 1995 during the Bosnian conflict.
|Kurdish people stand on a hill at the Turkish-Syrian border|
in the south-eastern village of Mursitpinar,
"We would like to appeal to the Turkish authorities in order to allow the flow of volunteers at least, and their equipment to be able to enter the city to contribute to a self-defence operation," Mr de Mistura said, addressing reporters in Geneva on Friday.
|Syrian and Turkish Kurds pray during Friday prayers at the Turkish-Syrian border|
But the vice chairman of Turkey's governing AK party, Yasin Aktay, told the BBC on Friday that all of Kobane's civilians had left the town and were already in Turkey.
"There is no tragedy in Kobane as cried out by the terrorist PKK [Kurdistan Workers' Party]", he said. "There is a war between two terrorist groups."
Turkey is reluctant to get involved militarily, partly because it is concerned about arming the Kurdish forces who are fighting the IS militants. Turkey fought a long civil war with its Kurdish minority.
It's quite a dilemma whether or not to arm Turkish Kurds and send them in to Kobane. If they survived, they might someday turn the guns on Turkey, but that's very unlikely any time soon as the Kurds have their hands full with IS. "A war between two terrorist groups" sums it up. Erdogan is hoping they will both kill each other off.
If he's wrong about all the civilians being evacuated, as the Special Envoy indicates, then he will have the blood of 700, mostly elderly, people on his hands, and consequently should be a candidate for crimes against humanity.
Tactically, I think he is making a huge mistake. He has the chance to be a hero and rescue the Kurds which might go a long way to improving relations with them. Instead, he is just infuriating Turkish Kurds even more.
|Targets hit by US-led air strikes in Iraq and Syria|
The source told the BBC that Kurdish fighters remained in control of two administrative buildings in the east of the town, saying that "heavy fighting has reached the 'security quarter' but it has not fallen yet".
Earlier, the UK-based Syrian Observatory for Human Rights said the jihadists had seized the main headquarters of the Kurdish military and civilian authorities.
"IS now controls 40% of the town," the monitoring group's director Rami Abdel Rahman told AFP news agency.
Turkey has been granted parliamentary approval for possible military action, allowing it to launch an offensive into Syria and Iraq against militants who threaten Turkey.
But while Turkish tanks are stationed along the border, there has so far been no move by Turkish forces into Syria.
Pro-Kurdish protesters have ramped up the pressure on the Turkish authorities to do more to save Kobane in recent days. Interior Minister Efkan Ala says more than 30 people have been killed in clashes with police in several Turkish cities this week.