( CNN ) -- A U.S. satellite project said Wednesday it has found evidence of additional mass graves in South Kordofan , a day after the Sudanese president called for a unilateral cease-fire in the state . The Satellite Sentinel Project said it has evidence of a total of eight mass graves in the area since June , including two additional ones recently in and around Kadugli . Kadugli is the capital of the border state . The project cited witness accounts and images of what it says are body bags . `` This report presents more visual evidence and new information by eyewitnesses ... of the collection and burial of human remains wrapped in tarps and/or body bags by the Sudanese Red Crescent Society , '' it said in a statement . Sudanese President Omar al-Bashir rejected the findings as propaganda from the west . The Satellite Sentinel Project , which is partially funded by U.S. actor George Clooney , is based on the Harvard Humanitarian Initiative 's analysis of satellite imagery and witness reports . In the past , the government has said rebels are to blame for the violence in the region , and has been engaged in a fierce campaign to battle what it says are militia in the area . Al-Bashir on Tuesday called for a two-week , unilateral cease-fire in the state , saying the government would assess the situation after that period . The report follows allegations by human rights groups that Sudanese forces have conducted widespread killings in the region this summer . The project has said its evidence is consistent with allegations that Sudan forces and militias `` have engaged in a campaign of killing civilians . '' Nuba fighters helped South Sudan during the civil war with Sudan , which raged for decades and left millions dead . South Sudan became an independent nation in July . South Kordofan remains a territory of the Sudanese government in the north , but borders South Sudan . In July , a United Nations report detailed new allegations of violence , including mass graves , in the volatile border state . Reported incidents included aerial attacks that killed civilians , attacks on churches , arbitrary arrests , abductions and house-to-house searches , said the report . `` This report provides only a small window on what 's happening in Southern Kordofan , '' Philippe Bolopion of Human Rights Watch said last month .
NEW : Sudanese President Omar al-Bashir rejects the findings . A U.S. satellite project says it has found evidence in South Kordofan . Its report includes witness accounts and images of what it says are body bags .