Abu Qatada has arrived home in London. He made no comment to waiting journalists.
A small group of protesters who had gathered outside chanted: "Out, out, out."
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Industrial vacuum cleaners and magnetic wands will be used each night during the summer to remove metal particles, dust, oil and grease.
Detective Superintendent Fiona McCormack said the Hotpoint FF175BP model had not been subject to any product recall.
Security for this year's event on July 8 has been reviewed following a spate of terror attacks in the capital.