Living conditions of survivors from last month's massive earthquake in Myanmar are becoming even harsher as heavy rain has pounded quake-hit areas.



The magnitude 7.7 earthquake struck central Myanmar on March 28. The country's ruling military says at least 3,564 people have died, and 210 others remain unaccounted for.



A large number of people who lost their homes in the quake are forced to live outdoors, such as on sidewalks and temple grounds, as the daytime temperature rises to nearly 40 degrees Celsius.



The second largest city of Mandalay, which suffered severe damage from the quake, was hit by intermittent heavy rain from Saturday to Sunday.



Footage taken by a Japanese medical team, which provides treatment in the city, shows strong wind blowing along with rain. It also shows some tents blown away and people cleaning up.



Aid officials say concerns exist about the spread of infectious diseases as the heat continues and sewage is flowing out due to the rain. That causes even greater hardships for quake survivors.



The quake has devastated regions already home to the largest number of evacuees who have fled fighting between Myanmar's military and pro-democracy forces.



The United Nations refugee agency UNHCR says the number of internally displaced people hosted by the affected regions is around 1.55 million.



It notes that the disaster has "exacerbated their already severe vulnerabilities."



Tom Fletcher, the chief of the UN Office for the Coordination of Humanitarian Affairs, or OCHA, spoke to NHK.



He called for cooperation in delivering humanitarian aid, saying that "we appeal to all the parties to give us complete access to those who need it most."



In neighboring Thailand, authorities say 16 people have been confirmed dead at the site of a collapsed skyscraper under construction in the capital, Bangkok.



More than 70 others remain unaccounted for. Rescuers are racing to find survivors in the rubble.