Unaccompanied teenage girl arrives at Naura detention centre claims refugee advocates The cost of detaining asylum seekers offshore is set exceed almost $1 billion in this financial year. An unaccompanied teenage girl has reportedly arrived at Nauru ... he first plane load of family groups arrive. AN UNACCOMPANIED teenage girl has been sent to Australia's detention centre on Nauru for processing, refugee advocates claim. Asylum Seeker Resource Centre spokeswoman Pamela Curr cited witnesses as saying the girl arrived by plane on Nauru today. "We have a witness reporting that a girl aged 15 or 16 came off a plane this morning," Ms Curr told AAP. She came off the plane first, on her own, unaccompanied. We've accepted the information (from the witness) because he is a local who gives us good information. Immigration Minister Scott Morrison's office has been contacted and further information is being sought. If correct, the girl will be the fourth unaccompanied minor to be sent to Nauru under the federal government's offshore processing regime. Mr Morrison said last Friday that an unaccompanioed boy and two unaccompanied girls were on the island. Under government policy, anyone seeking asylum who arrives in Australia by boat will not be settled here and will be sent on to Nauru or Manus Island in Papua New Guinea. Labor frontbencher Tony Burke said today that when he was immigration minister he did not transfer unaccompanied minors to Nauru because the facilities weren't "up to scratch."