- His 37-year-old widow, who police have not identified, suffered minor injuries and was treated at the scene
- The driver of the lorry stopped at the scene in River Road and was not arrested
- The suspects are described as white men. It is not known how they got away
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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.