ISTANBUL - Turkish warplanes attacked Kurdistan Workers Party (PKK) targets in southeast Turkey on Sunday in the first significant air operation against the militants since the launch of a peace process two years ago, Hurriyet news website said on Tuesday.The air strikes caused "major damage" to the PKK, Hurriyet said. They were launched after three days of PKK shelling on a military outpost in Hakkari province near the Iraqi border, it added.There was no immediate comment from the military on the report.