(ANSAmed) - BEIRUT, MARCH 15 - A mass grave with the remains of 300 people has been found in the last hours in Raqqa, in northern Syria and for three years from 2014 to 2017 controlled by ISIS. Medical sources and local civil protection report, along with the National Observatory for Human Rights in Syria. For months, local organizations have begun to investigate to find mass graves in the area of Raqqa, between Aleppo and the Iraqi border. In recent weeks, other mass graves have been found with thousands of remains of victims.