The fire on Friday evening destroyed all the accommodation blocks, medical facilities and offices and caused an estimated USD 55 million damage, an Immigration Department spokeswoman said under the department's usual condition of anonymity. Only the dining and recreation buildings survived the blaze.
She said 125 asylum seekers remained in police custody today over the riots and blaze. She did not know how many had been charged. Nauru Police Commissioner Richard Britten did not immediately return a phone call today.
Eight asylum seekers received hospital treatment following the riot in which protesters hurled rocks at guards and police armed with batons and shields.
Australia pays Nauru and Papua and New Guinea to hold asylum seekers who attempt to reach the Australian shore by boat. Their asylum claims are assessed at the island detention camps.
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In a further step to deter future boat arrivals, the government announced that since Friday all bona fide refugees who arrive by boat will be permanently settled in Papua New Guinea, a national of 7 million mostly subsistence farmers.
Rintoul said Friday's protest against delays in asylum claims being processed had been planned throughout last week. The fire had not been planned, he said.
"The Friday night protest was planned to be a breakout and march to the airport then back to the detention center," Rintoul said.
"What seems to have happened is that there has been far more resistance than had been expected," he said.
Most of the protesters were Iranian, Palestinian, Lebanese and Iraqis, he said.