Islamic State crisis: Heavy fighting on Iraq-Syria border
Iraqi Kurdish troops are said to have recaptured the town of Rabia, but suffered heavy casualties.
Meanwhile, IS fighters have been trying to dislodge Syrian Kurdish forces on the other side of the border.
It comes amid continuing air strikes by a US-led coalition on IS targets both in Syria and Iraq.
On Tuesday, British warplanes bombed an armed position and a vehicle in Iraq - the first IS targets struck by UK forces.