YANGON, Myanmar — Myanmar's junta on Monday announced a three-day mourning period for cyclone victims, while the country's neighbors said they will establish a task force to handle foreign aid distribution.

The mourning period starting Tuesday comes as people remain angry at what appears to be an inadequate government effort following the storm that left at least 130,000 people dead or missing.

It also follows on a declaration by China of three days of mourning, starting Monday, for the more than 32,000 dead from its own disaster, an earthquake in Sichuan province last week.

In a major concession after being slammed for blocking foreign help, Myanmar agreed to open its doors to medical teams from the 10 countries of the Association of Southeast Asian Nations, Singapore Foreign Minister George Yeo told reporters.

At an emergency meeting of ASEAN foreign ministers in Singapore, which included Myanmar Foreign Minister Nyan Win, officials agreed to set up an ASEAN-led task force for redistributing foreign aid.

"This mechanism will facilitate the effective distribution and utilization of assistance from the international community, including the expeditious and effective deployment of relief workers, especially health and medical personnel," Yeo told a news conference.

The bloc will work with the U.N. to hold an aid donor conference in Yangon on May 25, Yeo said.

Myanmar's military regime, meanwhile, allowed the U.N. humanitarian chief into the devastated Irrawaddy delta for a brief tour Monday, a U.N. official said.

But the United Nations said its foreign staff were still barred from the delta and described conditions there as "terrible," with hundreds of thousands of cyclone victims suffering from hunger, disease and lack of shelter.

John Holmes, the U.N. undersecretary-general for humanitarian affairs, flew by helicopter to the delta before returning to Myanmar's largest city, Yangon, to meet with international aid agencies, said a U.N. official who spoke on condition of anonymity because he was not authorized to speak with the media.

Others, including U.N. Secretary-General Ban Ki-moon, also will be allowed into the disaster zone this week.

An Asian diplomat said Myanmar has invited at least three representatives of several countries to tour the delta Friday. He spoke on condition of anonymity because the news has not been made public.

Ban is to travel to the delta after his scheduled arrival in the country Wednesday, U.N. spokeswoman Michele Montas said in New York.