Police in Essex are speaking to two young people, seen throwing away a laptop bag on the night of a fatal fire.
It's been revealed the house in Harlow - where Sabah Usmani and her five children died - was burgled on the night of the blaze.
Officers think several items, including a laptop, were taken after the family had gone to bed but before the fire was discovered.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants