Since yesterday, heavy vehicles have been used to barricade the road to prevent service providers from entering.
The United Nations refugee agency said the roadblock stemmed from ongoing opposition from local landowners to Australia contracting the company JDA Wokman to provide caseworker support services.
The agency said service providers had also been prevented from entering the two other refugee facilities on the island.
The Kurdish journalist and refugee Behreouz Boochani said staff from the healthcare provider IHMS have also been unable to pass the roadblock.
