All but two of the protesters inside the Immigration Department's Sydney office have been removed by police.
About 10 protesters walked into the Department of Immigration and Citizenship (DIAC) at Railway Square in Sydney about 4pm (AEST) on Tuesday.
Two of them locked themselves with metal D-clock around their necks to poles at counters.
Police arrived at the scene and called emergency services to remove the neck chains.
They had successfully removed all but the two protesters who were chained by 5.30pm (AEST) on Tuesday.
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"It is anticipated that two (more) men will be removed and arrested," a police spokeswoman told AAP.
She refused to comment on the fate of the other protesters.
But Rachel Rowe, from the Anti-Deportation Alliance, said the rest of the group who had been removed by police would not be charged.
She said they had been acting in solidarity with the detainees currently protesting on the roof of the Villawood detention centre.
It follows the suspected suicide of 36-year-old Josefa Rauluni on Monday.
"They have been without food and water and they are going to jump off the roof," Ms Rowe said.
"We are not leaving until DIAC speaks to the detainees... We're going to do everything we can to make their demands met."
