U.N. Secretary-General Antonio Guterres expressed concern Sunday over the plight of the 730,000 Muslim Rohingya refugees from Myanmar’s Rakhine state, calling on Myanmar’s government to take responsibility by dealing with the “root causes” of their flight and working toward their safe repatriation. Guterres spoke as he held a meeting with leaders of the Association of Southeast Asian Nations, to which Myanmar belongs. ASEAN leaders meet annually to try to work out common positions on pressing issues, but also maintain a policy of noninterference in each other’s affairs.