Immigration Minister Scott Morrison told parliament today that the protest of about 75 asylum seekers had been contained after reinforcements had been sent in.
He said the detainees had been advised to disperse last night, but was "advised a small number exhibited non-compliant behaviour".
"Reports to me suggest that some detainees became aggressive and were subsequently restrained," he said.
Mr Morrison said health officials assessed all detainees, two of which had suffered “minor injuries”.
“A further four detainees were taken to hospital for a range of injuries including suspected sprains or broken bones,” he said.
No staff were injured in the incident, which Mr Morrison had previously described as "fairly low level activity".
A spokesman for the Minister said Australian Federal Police officers were not involved.
The protest began six days ago, reportedly in support of Iranian asylum seeker Reza Barati who died during riots on Manus Island on February 17.
Greens Senator Sarah Hanson-Young had earlier called on Mr Morrison to clarify what action has been taken by authorities on Christmas Island.
She also linked reports of the peaceful protest to those ahead of the fatal Manus Island riots.
"I hope the Minister takes the opportunity to explain to the people what's happening," she said.
