At least 20 civilians, including women and children, were killed Friday when the Revolutionaries Army (Jaysh al-Thowwar) attacked a village in Aleppo province, a Syrian Civil Defense source told Anadolu Agency.The source said the armed group, which is cooperating with the YPG Kurdish forces in Afrin and Kobani, attacked opposition-controlled Tanab village.YPG is the armed wing of the Syrian Kurdish rebel group People's Democratic Union (PYD), which is affiliated with terrorist PKK group.Yaser Abdurrehim, an opposition leader in Aleppo, said that opposition forces retook control of Tanab village. He denounced the killing of civilians by the "self-proclaimed revolutionaries."At least 250,000 people have been killed since the Syria conflict began in 2011, according to UN figures, with 7.6 million internally displaced and over four million having fled to nearby countries.