ARBIL: Two civilians were killed Sunday in Iraq's northern Kurdistan region by a Turkish army bombardment as forces battled the Kurdistan Workers' Party (PKK) rebels, local officials said.

Turkey regularly targets northwest Iraq in operations against the PKK, which Ankara considers a terrorist organisation.

The Kurdish separatists have waged a decades-long insurgency against Turkey, and maintain bases in the rugged mountains across the border in Iraq.

The latest violence comes six days before a regional summit in Baghdad.

The Iraqi civilians were killed in Iraq's Zakho district, an area bordering Turkey, said local mayor Farhad Mahmoud. "They had gone to an area where it is advised not to go," Mahmoud said, adding that they were not from the area, but had been visiting from the city of Mosul. "They were caught in a Turkish bombing and died."

PKK fighters said clashes were ongoing Sunday.