The key Syria-Turkey border town of Kobane might fall to Islamic State (IS) fighters soon, an official there has told the BBC.
A flag of Islamic State has been seen flying over a building on the eastern edge of Kobane.
The official, Idriss Nassan, confirmed IS was now in control of Mistenur, the strategic hill above the town.
Kobane has seen intense fighting over the past three days as Syrian Kurds try to defend the town.
The IS militants have been besieging it for nearly three weeks. Since then, more than 160,000 Syrians, mainly Kurds, have fled across the border.