The Commissioner of the London Fire Brigade, Ron Dobson, has been giving evidence at the inquest into the fatal fire at the Lakanal House tower block in Camberwell.
Six people were killed in the blaze in July 2009. Ronke Phillips reports.
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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.