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The detention centre where the Uyghurs - who had been charged with no crime, apart from entering Thailand without a visa - were kept was known to be unsanitary and overcrowded.

The BBC understands that conditions in the camps are unsanitary, food barely sufficient, and many of the freed workers, like Mike, are in poor health.

Jasmine Basran, head of policy and campaigns at homeless charity Crisis, said: "People who have already experienced significant disadvantage are being forced to live without adequate support in unsafe, unsanitary and frankly unliveable conditions."

The suit alleges youths were forced to “relieve themselves” in bottles and milk cartons and were stuck in “filthy and unsanitary” conditions, infested with cockroaches.

Similarly, park-goers have trampled sensitive vegetation in the Merced River, while trashing the area and leaving “unsanitary conditions” due to a lack of restrooms, park officials said.