A report into London 2012 has criticised the number of affordable tickets made available to the public. On average, it cost more than £300 to see Mo Farah win gold in the men's 5000 metres race.
It comes on the same day he's back at the Olympic Stadium to launch the first sports event to take place there since the London 2012 Games.
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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.