Wilson Parking centres in Melbourne and Sydney were blockaded in June by activists who oppose asylum-seekers being detained in the camps. The Whistleblowers Activists and Citizens Alliance had been running a campaign calling on people to blockade or boycott Wilson Parking centres on Saturday September 3.

Ferrovial, the new Spanish owner of Broadspectrum, has also told the Immigration Department it will not re-tender for its contracts operating the centres on Nauru and Manus Island.

The department had initially planned to run a new tender process for the camps this year but recently exercised its rights to extend Broadspectrum's existing contract until the end of next year.

The withdrawal of Broadspectrum and Wilson Security leaves only two major security contractors, Britain's Serco and G4S, as potential future operators of the camps.

Wilson Security has bowed to pressure from human rights activists to stop work at detention centres Refugee protests in Ann Street W

G4S previously ran the camp at Manus between 2013 and 2014 before Broadspectrum took over the management of the camps, but its guards were alleged to have been involved in violence against detainees.

G4S is under pressure to earn more income from its Australian operations, which took a net loss of $13.1 million in 2015, according to accounts filed with the Australian Securities and Investments Commission.

However, G4S told the Financial Review that it was "not participating in any tender process" for contracts relating to the Manus or Nauru camps.

G4S has agreed to pay $1.6 million in claims for alleged psychiatric injuries related to riots on Manus Island in February 2014 during which several detainees were injured and one died and has warned that future claims could be made against the company.

​Serco told investors in its half-year results statement to the London Stock Exchange in August that "the potential opportunity for work related to Australian offshore immigration detention services" had not been included in its pipeline of "major new bid opportunities".