The first round of bombardments, which were unleashed late Friday, has threatened to unravel a fragile truce that has largely held since 2013.
The F-16s took off from Diyarbakir in southeastern Turkey and headed towards the PKK's rear bases in Mount Kandil, CNN-Turk and NTV channels said.
The PKK yesterday said that the conditions were no longer in place to observe the ceasefire, following the heaviest Turkish air strikes on its positions in northern Iraq since August 2011.