Two men are being treated in hospital after being found with stab wounds outside a McDonalds restaurant in Regent Street. It happened just before 3:30 Saturday morning.
The men's injuries are not thought to be life threatening and no arrests have been made.
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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.