 In June 2015, the main Syrian Kurdish militia, YPG, and the Turkey's main pro-Kurdish party, HDP, accused Turkey of allowing Islamic State (ISIL) soldiers to cross its border and attack the Kurdish city of Kobanî in Syria.The conflict between Turkey and PKK escalated following the 20 July 2015 Suruç bombing attack on progressive activists, which was claimed by ISIL.During the 24–25 July 2015 Operation Martyr Yalçın, Turkey bombed alleged PKK bases in Iraq and PYD bases in Syria's Kurdish region Rojava, purportedly retaliating the killing of two policeman in the town of Ceylanpınar (which the PKK denied carrying out) and effectively ending the cease-fire (after many months of increasing tensions).