Rohingya rebels, whose attack on Burma security forces last month triggered military reprisals, have declared a month-long truce as refugees continue to flood across the border into Bangladesh — and scant basic resources, hunger and illness. The band of Muslim insurgents calling itself the Arakan Rohingya Salvation Army issued the truce statement on its Twitter account and urged Burma’s government to reciprocate in order to assist all victims regardless of their background. The rebels, who say they are fighting to protect their minority members against government-sponsored persecution, launched their first known attacks last October and again on August 25. According...