Glenn Greenwald's partner David Miranda is mounting a legal challenge to the U.K.'s Home Office border agency following his detention at London's Heathrow Airport, Guardian Editor Alan Rusbridger told BBC News Tuesday.
British authorities at Heathrow detained Miranda for nine hours on his way to Rio de Janeiro Sunday, and seized his computer, cellphone and memory thumb drives, Miranda told the Associated Press.
Miranda was held under a provision of the U.K.'s Terrorism Act called Schedule 7, which allows security agencies to stop and question people at borders.
Rusbridger told the BBC there would be a legal challenge over whether the police were legally justified to to seize Miranda's property. The Guardian said it's "supportive" of Miranda but it is not leading the legal challenge.