While on patrol duty, the soldiers had discovered several caves filled with supplies by kurdish guerrilla.[157] 22 July - 2 Turkish police officers were killed in their home in Şanlıurfa Province; PKK claimed responsibility as revenge for the 2015 Suruç bombing.[158] 23 July - 1 Turkish police officer was killed and another seriously wounded when masked PKK gunmen opened fire on them in Diyarbakir Province.[159] On the same day one soldier was killed and two wounded when shots were fired at a border checkpoint from beyond the Syrian border; Turkish security forces returned fire.