A young girl who died in unexplained circumstances in south London was a popular child who "was always giggling away about something".
A 33-year-old man has been arrested over the death of six-year-old Ellie Butler.
Ellie collapsed in her home in Sutton, south London, on Monday afternoon. Paramedics treated her at the scene but she was pronounced dead at hospital.
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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.