Disabled adults and families with disabled children are challenging the legality of the Government's so-called "bedroom tax", arguing that it unlawfully discriminates against them.
New housing benefit regulations have led to reductions in benefit payments to tenants in the social housing sector assessed to be under-occupying their accommodation.
Lawyers in 10 cases at London's High Court are seeking a ruling that the regulations, introduced on April 1, "unjustifiably discriminate against housing benefit claimants who are disabled or care for disabled family members".
More top news
Thirty-one people have been injured, nine seriously, after an Etihad plane travelling to Indonesia hit "severe and unexpected turbulence."
Prosecutors described it as one of the "most serious" cases of animal neglect they had ever dealt with.
A baby kangaroo had a narrow escape when a large eagle swooped down and grabbed him in his talons, carrying him away.