Myanmar's military rulers have thrown a tightening ring of security around Yangon, blocking aid workers, foreign diplomats and journalists from reaching cyclone-battered regions where millions need food and medicine.
New roadblocks manned by armed police have sprung up around Myanmar's largest city. Authorities at the checkpoints take down passport information and license plate numbers and sometimes interrogate drivers and their foreign passengers before ordering them to return to Yangon.
"A circle has been drawn around Yangon and expats are confined there. While you are getting aid through, it's like getting it through a 3-inch pipe, not a 30-inch pipe," said Tim Costello, president of the aid agency World Vision-Australia, in Yangon....