There are fresh calls today for buses to be banned from Oxford Street.
Hundreds of them travel down the busy shoping road every hour - one high street retailer claims the so-called "Wall of Red' is bad for business.
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George Michael died in December last year at the age of 53.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Those gathered on the bridge fell silent at 2.40pm - the time the first call was made to police exactly seven days ago.