Government 'refused to guard Miranda confidentiality'

David Miranda's lawyer said he was taking legal action because the Home Office and police had refused to provide assurances they would not share files seized on Miranda's laptop.

Matthew Ryder QC told judges the Home Secretary and the commissioner of the Metropolitan Police had failed to give undertakings "protecting the confidentiality of sensitive journalistic material".

David Miranda was held at Heathrow while on his way from Berlin to Rio. Credit: APTN/Globo TV

"That is why we are here now," Ryder said at London's High Court.

Miranda, the partner of Guardian journalist Glenn Greenwald, has launched an application for judicial review over his detention at Heathrow airport under the Terrorism Act.