Speaking to our reporter Clare Fernyhough at City Hall today, Will Smith, with son Jaden, said how important it is for young people to have positive role models.
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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.