The 230 bodies were found by relatives of the victim’s who were all from the Sunni Sheitaat tribe, said the so-called Syrian Observatory for Human Rights on Wednesday.
The latest discovery brings the total of Sheitaat tribe members killed by Takfiri terrorists during their summer assault on Deir ez-Zor to 900.
The UK-based group went on to say that a “vast majority” of the victims were civilians who were massacred in cold blood following the tribe’s rise up against ISIL.
The tribe members found the mass grave after returning to their villages following months of displacement caused by the ISIL militant’s atrocities.
According to the observatory, hundreds more of the Sheitaat tribe members are still missing.
The ISIL terrorists currently control some parts of Syria and Iraq. They have been committing heinous crimes in the captured areas, including mass executions and beheadings.
More than 200,000 people have died so far in the conflict in Syria, according to UN High Commissioner for Human Rights Zeid Ra’ad Zeid al-Hussein.
Over 7.2 million Syrians have also become internally displaced due to the ongoing Syrian crisis, according to the UN.
Source: Press TV