Are First Nations people being held illegal in detention centres?

Lawyer Claire Gibbs represents two clients who identify as Indigenous Australian Source: AAP

The Department of Home Affairs says it's working through the night to determine if it's holding any First Nations people in its immigration detention centres illegally.

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23 people have claimed to be Indigenous following a landmark High Court decision last month, which ruled Aboriginal people could not be detained or deported, even if they do not hold Australian citizenship.