UN rights chief Volker Turk on Friday condemned the “heinous killing” of two young Egyptian sisters whose bodies were dumped in sewage at the Al-Hol detention camp in Syria. He urged the international community and Kurdish-led forces controlling the area to redouble their efforts to protect thousands of women and children still being held in such camps. “The deaths of these young sisters who had already endured so much misery is deeply distressing. The circumstances behind their deaths, and the manner in which they were killed, beggar belief,” Turk said in a statement. The bodies of the girls,…