The partner of a Guardian journalist, who wrote stories revealing mass surveillance by the US National Security Agency, was detained at Heathrow Airport and had his electronic items confiscated.
David Miranda was stopped in the capital under the Terrorism Act when attempting to travel to Rio de Janeiro, where he lives with reporter Glenn Greenwald.
Mr Greenwald told The Guardian that the detention of his partner was a "failed attempt at intimidation".
The independent reviewer of terrorism legislation said he will examine the detention of David Miranda at Heathrow Airport.
Nick Clegg has backed David Cameron's decision to send a top civil servant to The Guardian to urge them to destroy classified data.
The Guardian journalist whose partner was held at Heathrow Airport hits out at the UK as he gives ITV News his first British TV interview.