BANGKOK (AP) — International aid group Doctors Without Borders said its field survey has found at least 6,700 Rohingya Muslims were killed between August and September in a crackdown by Myanmar's security forces. The group, known by its French acronym MSF, said in a statement made available Thursday that it had conducted the survey in refugee camps in Bangladesh and estimated that at least 9,000 Rohingya died in Myanmar's Rakhine state between Aug.