St George claimed staff had turned a blind eye to sexual assaults, which included the rape of six men in the centre's men-only tent section - with the victims then forced to return to that section because there was no way of separating them from their attackers.
Some detainees had been forced by "heavies" - other asylum-seekers - to sew their lips together, he told SBS, and one man had his eardrum punctured after solvent was repeatedly poured into his ear. "In Australia, the facility couldn't even serve as a dog kennel. The owners would be jailed," he said. "I took the position with every intention of making the place a safer environment, but it proved quite rapidly to be an impossibility ... For the first time in my life, I felt ashamed to be an Australian."
Burke, who described the claims as "horrific", told ABC radio: "I'll be in Manus in the next couple of days, and I'll have a look for myself ... There's no doubt that what has been described involves some situations and crimes which must not be allowed to occur."
The Immigration Department said that it was "unaware of the claims ... of unreported acts of self-harm, suicide attempts or incidents of rape at the [Manus] centre". Sky News Australia reported that about 70 asylum seekers had been flown off Manus Island, believed bound for Australia.
Burke reportedly also plans to visit Nauru, to inspect the estimated A$60 million ($70 million) of damage caused to the detention centre in a riot last Friday.
The Manus allegations came as the Foreign Minister, Bob Carr, said the Government was seeking a site for another offshore processing centre in the Pacific, besides the Manus and Nauru facilities. Carr, who visited the Solomon Islands this week to mark the end of Australia's regional assistance mission, said he would not "twist anyone's arms", but "if other nations in the Pacific see the value in what we're doing ... then we stand ready to talk to them".
Rudd said the Manus claims would be investigated but the new policy would stand. "We don't apologise for our policy of saying to people-smugglers that if you bring people to Australia by boat, that they will not be settled in Australia," he told 3AW radio.
Four boats carrying 299 people have arrived since last Friday. They will all be sent to Manus for processing and possible resettlement.