Ten asylum seekers who escaped from a remote detention centre in South Australia six days ago are safe and well, their supporters have said.

Police have been searching for eight men and two boys who were among 35 Afghan, Iranian and Iraqi migrants who broke out of Woomera camp with the help of activists.

The others have all been recaptured.

Most of the escapees have been caught

There had been fears for the welfare of the remaining 10 as temperatures in the desert around Woomera have plunged below freezing each night.

But on Wednesday, a spokesman for protesters camped outside Woomera said he had received a message from a group calling itself the Desert Liberation Front saying the 10 had reached safety.

"We had a message saying they were in a safe area," said Dave McKay, a spokesman for the group Refugee Embassy.

Hunger strike

A police spokesman said a search was continuing for activists who helped the detainees escape. Four people have already been charged and face a maximum penalty of 10 years in prison.

Immigration officials have said all of those who originally escaped - 28 Afghans, six Iranians and one Iraqi - had had their visa applications rejected.

Woomera, the most isolated of Australia's detention camps for illegal immigrants, has frequently been the scene of hunger strikes, escapes, riots and attempted suicides in the last two years.

Eleven of 50 detainees who escaped from the camp in March have yet to be traced.

The immigration department said on Wednesday that 89 detainees at Woomera remained on hunger strike for a tenth day.