Abu Qatada was denied bail by a judge who said it would be "exceptionally problematic" to allow the radical preacher to remain on London's streets during the Olympic Games.
Qatada will remain in a British prison for at least five months as he launches fresh action against the Government's bid to deport him.
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The talks descended into crisis on Friday when Canada's trade minister Chrystia Freeland walked out of meetings.
Police in New York are still investigating what the substance is and whether it could be harmful.
The Sherlock actor made the comment while he received an award for his humanitarian work.