Violent confrontations between al-Hamzah and Ahrar al-Sharqiyah occurred in Afrin city of Aleppo province.
According to the source, the conflict was caused primarily by ownership of looted property.
Al-Hamzah militants have killed a field commander and his deputy of Ahrar al-Sharqiyah group. Ahrar al-Sharqiyah fighters in turn disarmed and captured over 200 al-Hamzah members.
Turkey reportedly had to step in to prevent a slaughter. The Turkish authorities declared a ceasefire and mutual exchange of hostages.