Villawood immigration detention centre staff are trying to talk three asylum seekers out of a roof-top protest which is now into its third day.
Three Fijian nationals - a woman and two men - remain on the roof of the detention centre in Sydney's west after starting their protest on Monday morning (local time), the Department of Immigration (DIAC) has confirmed.
One of the three was due to be deported on Monday but took to the roof as guards from the centre's operator, Serco, arrived to take her to the airport.
Guards on Tuesday attempted to deport the woman's husband but stopped when the woman threatened to the jump off the roof, the Refugee Action Coalition (RAC) said.
The RAC's Ian Rintoul said it was unclear whether the three were being given any food or water by staff, but other detainees have been prevented from doing so.
He said Serco staff had tried to smash their way into the ceiling of the building with axes, and had laid out mattresses around the complex.
"Mattresses do nothing for the fall. The staff there are just irresponsible," Mr Rintoul told AAP.
A DIAC spokesman told AAP that staff at the centre were negotiating with the trio.