A White House spokesman said the decision to detain Mr Miranda "was not made at the request or with the involvement of the US government".
But he said British officials did give them a "heads up" about the detention.
David Miranda, 28, was held for nine hours by police at Heathrow on Sunday.
Police held Mr Miranda under terrorism laws but have not said why.
He said he was kept in a room and quizzed by "six agents". (+ video) » | Monday, August 19, 2013
