Bangladeshi authorities are trying to restrict the movement of Muslim Rohingya refugees fleeing violence in Myanmar into crowded border camps and have started immunising tens of thousands of children against diseases.
Prime Minister Sheikh Hasina, wo has lambasted Myanmar for "atrocities," left Dhaka to address the annual U.N. gathering in New York.
Abdus Salam, a doctor in a state-run hospital in Cox's Bazar district, says that some 150,000 children will be immunized over seven days for measles, rubella and polio. UN says there are some 240,000 children in dire conditions.
Police meanwhile are checking that the refugees don't spread out to nearby towns.