FIGHTERS from the 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. 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.…