Police in Ethiopia say it has uncovered a mass graves with 200 bodies near the border between the Somali and Oromia regions of the country.
Hundreds of thousands of people grew during the past year with violence there.
Local media reported that the tomb was found during an investigation into allegations of crimes committed by the former president of the Somali region of Ethiopia.
Abdi Mohammed awaits trial over allegations that he has instigated ethnic conflicts.
The notorious regional security forces known as Liiu Police are charged with the execution of murders in the area between the Somali and Oromian regions and report directly to the regional president.
The police are trying to identify the 200 bodies found.
Mr. Mohammed was forced to resign in August and was arrested a few weeks later after the outbreak of violence in the capital, Jijiga.
He is said to have oversaw widespread abuse of rights, including torture, rape and murder during his 13-year reign.
Last month, state broadcaster Fana reported that he tried to evade police custody by climbing a window in front of the court's appearance