U.S.-backed Syrian Democratic Forces say they will fight Turkey and allied groups in Kobani

U.S.-backed Kurdish-led Syrian Democratic Forces (SDF) vowed on Thursday to fight Turkey and groups it supports in the city of Kobani in northern Syria.

The SDF is spearheaded by the YPG militia, which Turkey sees as an extension of the outlawed Kurdistan Workers Party (PKK) whose militants have fought the Turkish state for 40 years.