DJENNE, Mali — Malian soldiers killed people accused of ties to radical Islamists at a bus stop around the time the French-led military intervention began, a witness said Wednesday, describing how soldiers shot the victims and threw their bodies into wells.

The account from the witness, who insisted on anonymity for fear of reprisals, came the same day a French human rights group accused Malian forces of dozens of “summary executions” and other abuses as they confront extremists.