Hopes are fading for people trapped beneath rubble in Myanmar and Thailand with the passing of a crucial 72-hour rescue window after which survival rates fall sharply.

Rescue crews in Myanmar pulled a 26-year-old man out alive from the rubble of the capital city hotel where he worked early Wednesday, but most teams were finding only bodies five days after a massive earthquake hit the country.

As deaths mount, some volunteers complained of being blocked by Myanmar’s military from reaching a rebel stronghold that was badly hit.

Bodies trapped under the rubble of destroyed buildings in Sagaing and Mandalay cities are decomposing in Myanmar’s stifling heat.

Rescuers have pulled two men alive from the ruins of a hotel in Myanmar’s capital on Wednesday and a third from a guesthouse in another city.

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Myanmar's ruling junta should free up movement by international aid workers to help survivors of a devastating earthquake, even in areas controlled by groups battling it, aid and human rights groups said,