In a landmark case, the Court of Appeal has ruled that thousands of people may have been unlawfully held in immigration removal centres in recent years.
In a case brought by five asylum seekers who were challenging the provisions of the Dublin III regulations, judges ruled that detained people could not be held indefinitely.
Asylum seekers must claim asylum in the first country in which they arrive. If they arrive in the UK, but the Home Office finds out they first passed through another safe country, it can send them back there.
They may be locked up indefinitely as discussions between countries take place, a practice now ruled unlawful.
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