The independent reviewer of terrorism legislation has said he would be asking questions about the detention of David Miranda, the partner of journalist Glenn Greenwald, under schedule 7 of the Terrorism Act.
David Anderson QC said it was "extremely unusual" that Mr Miranda had been held for nine hours and confirmed he would be asking questions about the case.
"Part of my job is to review the operation of this power, and I will be asking questions as to why it was used in this way in this case", he said.
Mr Anderson also revealed that of the 60,000 people that were questioned at Britain's ports last year, only 40 were held for more than six hours.
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.