Police have released new images of the burnt-out house where a mother and her five children were killed in a fire in Essex.
It's thought the blaze at their home in Harlow in October last year was started by burglars.
The full story now from Tom Barton.
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.