Dozens were killed in a major attack by government-backed militias on Shearia town in Sudan's Darfur region, the latest in a wave of raids since a peace deal was signed earlier this month, rebels said on Saturday. A spokesman for the main rebel faction group who signed the deal in the Nigerian capital Abuja on May 5 told Reuters from the field in Darfur that despite the agreement, heavy attacks have continued on the ground. "The attack on Shearia was yesterday — the Janjaweed have attacked many many places in South Darfur despite the peace deal," al-Tayyib Khamis said. Shearia is in South Darfur. "There are about 20-25 dead and many injured but it's unclear as yet how many," he said. The government and the Minni Arcua Minnawi faction group signed a peace deal on May 5 under intense global pressure. But two other factions at the talks did not sign saying it was not fair. Thousands of Darfuris have since been demonstrating angrily against the agreement. Arab militias, known locally as Janjaweed, were not part of the peace talks in Abuja. The United Nations said as Khartoum armed them to fight the mostly non-Arab rebels, the government represented them. Khartoum admits arming some tribes to fight the rebels but denies links to the Janjaweed, saying they are outlaws.