On 20 July 2015 , a bombing in the Turkish district of Suruç , allegedly perpetrated by the ISIL-linked Dokumacılar group , killed 32 young activists and injured over 100 . On 23 July , ISIL militants attacked Turkish military positions , killing one soldier and injuring two others . This was largely seen as a '' casus belli , '' which resulted in Turkish Prime Minister Ahmet Davutoğlu taking the decision to begin active air operations against PKK and ISIL positions south of Turkey 's border
a bombing
2015 Suruç bombing
Operation Martyr Yalçın