A £10,000 reward is being offered for information on an Essex house fire that killed a mother and her five children.
The blaze killed Sabah Usmani, her daughters Hira and Maheen and her sons Sohaib, Muneeb and Rayyan in Harlow last month.
Police are keen for information on a group of young men seen outside the house on the night of the fire.
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At least five people have suffered minor injuries but the cause of the blast is still unknown.
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