AROUND 20 civilians were killed in an attack in eastern Democratic Republic of Congo, the army and M23 rebels said, accusing each other of launching the assault. The deaths were the latest fallout from fighting between Congolese troops and M23, whose offensives have forced tens of thousands of people to flee their homes and worsened the region's decades-long security and humanitarian crisis. Thursday's attack took place in the town of Mweso in Masisi territory, around 80 km (50 miles) from the city of Goma in North Kivu province, the two sides said. They gave different accounts of what happened. The…