"A peshmerga was killed by PKK fire, as peshmerga and Iraqi border guards patrolled the Darkar area," on the border with Turkey, local mayor Adib Jaafar told AFP.

The killing comes after five Iraqi Kurdish peshmerga fighters were killed on Saturday in a PKK ambush in northern Iraq, which the rebels said was because they had "refused entry of the peshmerga" into an area under their control.

The PKK's pan-Kurdish agenda -- for a homeland straddling Syria, Turkey, Iraq and Iran -- has often put it at odds with Iraq's autonomous Kurdish government, which has sought to maintain good relations with Ankara.

It comes after Turkey launched a new offensive in April -- by air and sometimes land -- targeting Iraq rear-bases of the PKK, which it considers a "terrorist" organisation.

On Saturday, Turkish drones bombed a Kurdish refugee camp in Iraq, killing two civilians and a PKK commander.

Turkish troops have maintained a network of bases in northern Iraq since the mid-1990s on the basis of security agreements struck with Saddam Hussein's regime.

The PKK has waged a rebellion in the mainly Kurdish southeast of Turkey since 1984 that has claimed more than 40,000 lives.