Turkish warplanes bombed 13 Kurdish rebel targets in northern Iraq, Turkey's military said Thursday. Turkey has conducted frequent air raids on suspected positions of the Kurdistan Workers' Party, or PKK, in northern Iraq. Earlier this year, it also launched a weeklong ground offensive there. The warplanes attacked rebel targets late Wednesday in the Zab region, near the Turkish border, the military said in a statement posted on its Web site. The military said it was trying to determine whether there had been rebel casualties. There was no immediate comment from the rebel group. Thursday's statement said the military was determined to press ahead with anti-rebel operations both inside Turkey and across the border in Iraq "according to military needs."