According to a Turkish military official, 18 militants of the PKK were killed overnight during heavy skirmished at the border town of Nusaybin after they reportedly attempted to retreat into the Syrian town of Qamishli.
Qamishli is jointly controlled between Kurdish YPG fighters and the Syrian Arab Army. However, Ankara views the YPG as an affiliate of the outlawed PKK.
Turkish security forces were conducting a sweep through Nusaybin when clashes broke out as alleged members of the militant Kurdistan Workers Party (PKK) tried to reach the nearby Syrian city of Qamishli as to avoid the Turkish Army.
On Sunday, PKK militants detonated roadside explosives in Nusaybin as a police vehicle passed, killing one police officer and wounding three others, the security sources said.
On Saturday alone, 15 PKK militants were killed in the towns of Nusaybin, Sirnak and Yuksekova, the Turkish military said in its daily report on clashes Sunday. However, the Turkish Army was unwilling to reveal its own death toll during these battles.