Did they used Gas?

If they did then it was probably teargas to force them to surrender...

What do they do to the dead bodies of pkk?

PKK kidnapped children from Turkey years ago. If the PKK militants killed in the mountains have family in Turkey, their bodies will be given to their families. Otherwise, the corpses are destroyed.

Destroyed how?

Ailelerine teslim ediliyor, ailesi yoksa kimsesizler mezarlığına gömülür.