The world famous Cirque Du Soleil comes to the capital today with its Michael Jackson tribute show. It'll be on at the o2 arena and features 64 international dancers, musicians and acrobats.
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A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.