Twice as many asylum seekers are in Australia for medical treatment than remain in Papua New Guinea and Nauru. Home Affairs secretary Michael Pezzullo says 562 people remain in PNG and Nauru - about 23 per cent of peak levels in June 2014. Another 1117 have been brought to Australia for medical treatment or to accompany family members. Regional processing on Manus Island will be terminated at the end of November. "The remaining transferees on Manus Island will shortly be moved to Port Moresby, with services there to be managed by the PNG government," Mr Pezullo told a Senate estimates hearing in Canberra on Monday.