Refugee activists have clashed with police in a peak-hour march through inner Sydney.
Riot police were called in as hundreds rallied along George Street on Friday evening chanting "Free, free the refugees".
At times the throngs spilled onto city roads, disrupting traffic and prompting physical confrontations with police.
The demonstration comes after the death of 23-year-old Reza Berati during violent clashes at Australia's Manus Island immigration detention centre.
Refugee Action Coalition spokesman Ian Rintoul told the rally the Iranian's death would not be forgotten.
"They want to push it aside," he said. "They want it to be covered up in the lies and the cover-ups which are now under way on Manus Island.
"We are not going to allow that to happen."
The protesters have called for the Papua New Guinea facility to be shut down and Immigration Minister Scott Morrison to step down.
"Scott Morrison, blood on your hands," they cried as the march approached the Immigration Department's Sydney headquarters.
