Fighters from Democratic Republic of Congo's M23 rebel group killed at least 20 men and raped scores of women and girls in the east in November, Amnesty International said in a report on Friday.
The militia, which stepped up its offensive in regions near the borders of Rwanda and Uganda last year, dismissed the accusations, saying they were part of a smear campaign.
The reported death toll was much lower than estimates from the United Nations, which said in December the rebels executed at least 131 people in reprisal killings in a campaign of murder, rape and looting in Kishishe and Bambo villages.
