A Rohingya refugee reacts while holding his dead son after crossing the Naf river from Myanmar into Bangladesh in Whaikhyang on October 9, 2017. The arrival of more than half a million Rohingya refugees who have fled an army crackdown in Myanmar's troubled Rakhine state since August 2017 has put an immense strain on already packed camps in Bangladesh as it was dangerous because overcrowding could heighten the risks of deadly diseases spreading quickly.