"These atrocities demand more than words from concerned governments; they need concrete responses with consequences," HRW deputy Asia Director Phil Robertson was quoted by Iran's Press TV news agency as saying.
A HRW report, in turn, said "soldiers had beaten, sexually assaulted, stabbed, and shot villagers who had gathered for safety in a residential compound" in western Myanmar on August 27.
The survivor was echoed by Robertson, who cited the near-total destruction of the village in the wake of the raid.
"The soldiers loaded the bodies – some witnesses said a hundred or more – into military trucks and took them away," he said.
Myanmar refuses to recognize the Rohingya Muslims as citizens, mainly seeing them as illegal immigrants from Muslim Bangladesh.
The Myanmar army's subsequent brutal crackdown resulted in clashes and the death of hundreds of Rohingya people. More than half a million Rohingya Muslims fled Myanmar, crossing into neighboring Bangladesh.