US Secretary of State Rex Tillerson on Wednesday called for a credible investigation into allegations of human rights abuses against Rohingya Muslims, Reuters reports. Tillerson earlier met with Myanmar’s civilian and military leaders. More than 600,000 Rohingya Muslims have fled to Bangladesh since late August, driven out by a Myanmar military counter-insurgency clearance operation in Rakhine state. “Scenes of what occurred are just horrific,” Tillerson told a joint news conference with Aung San Suu Kyi, the de facto head of the civilian administration. Tillerson also held separate talks with the commander of Myanmar’s armed forces, Senior General Min Aung Hlaing.