More:The police will be asked to justify the detention of a journalist's partner under terror laws, the chairman of the Home Affairs Select Committee has said.
Keith Vaz said the full facts of David Miranda's nine-hour detention at Heathrow must be established quickly.
Mr Miranda's partner is the Guardian's Glenn Greenwald, who has written about US whistle blower Edward Snowden.
The Metropolitan Police confirmed Mr Miranda was held but has not explained why he was detained.
BBC News - David Miranda detention: MP asks police for explanation
Could this have some thing to do with the leaked 400 gigabyte of date from wikileaks?