Fighter jets bombed 31 targets in the Hakurk region and "successfully completed the operation safely returned to their bases," the sixth time in seven days Turkey has attacked positions held by the Kurdistan Workers' Party, or PKK, officials told CNN.

The airstrikes have come in response to last week's attack by PKK rebels inside Turkey that killed at least 15 Turkish soldiers. The PKK, labeled by both Turkey and Iraq as a terrorist organization, is continuing to operate in the Qandil Mountains in northern Iraq bordering Turkey and Iran, officials say.