The official from the Sudan Liberation Movement (SLM) accused the government on Friday of committing with the bombing attacks a "flagrant violation of the ceasefire" that has been in place since 3 September.
Speaking to AFP in Cairo by telephone, Abd Allah Hassab Allah said the bombing raid attacked SLM positions and villages in the Cornei region, around 130 kilometres north of al-Fasher, the main town in the semi-desert Darfur.
"At least 10 civilians, including women and children, have been killed and a certain number have been injured," he said.
Since February, Darfur, on Sudan's border with Chad, has been the scene of clashes between SLM rebels and government forces backed by local militias.
At least 3000 people have been killed and hundreds of thousands displaced by the fighting, with the conflict choking economic development in the region.
The government and the SLM are due to restart negotiations aimed at reaching a comprehensive settlement on 4 December in Chad.