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The United Nations High Commissioner for Refugees said Sunday that the exodus of Rohingya Muslims from Myanmar to Bangladesh is "the most urgent refugee emergency in the world" right now.

Filipo Grandi told reporters in the Bangladeshi town of Cox's Bazar that the needs of the more than 430,000 people who have fled terrible violence in Myanmar over the last month are enormous and that the international community must step up financial and material aid to Bangladesh if the South Asian nation is to be able to help the refugees.

The latest round of violence in Myanmar's Rakhine state erupted when a Rohingya insurgent group launched deadly attacks on security posts Aug. 25, prompting Myanmar's military to launch "clearance operations" to root out the rebels. Those fleeing have described indiscriminate attacks by security forces and Buddhist mobs. The government has blamed the Rohingya, saying they set fire to their own homes, but has provided no proof.

The U.N. and others have described the violence as ethnic cleansing.

Rohingya have faced persecution and discrimination in majority-Buddhist Myanmar for decades and are denied citizenship, even though many families have lived there for generations.

The government says there is no such ethnicity as Rohingya and that they are Bengalis who illegally migrated to Myanmar from Bangladesh.

Grandi toured the parts of the massive refugee camps that have sprung up to accommodate the new refugee. Cox's Bazar also has a large Rohingya camp that has housed Rohingya fleeing persecution over the decades. Another 300,000 older refugees make their home in these camps.

"This has been since the 25th of August the fastest and most urgent refugee emergency in the world," Grandi said.

"I was struck by the incredible magnitude of their needs. They need everything. They need food, they need clean water, they need shelter, they need proper health care," he said.

Grandi said he was thankful that Bangladesh's government had kept its borders open for the terrified Rohingya "in a world that has often turned hostile to refugees."