Police have released an image of Mohammed Hussein as they continue to hunt for his killer.
A post-mortem at Haringey Mortuary gave his cause of death as a single shotgun would to his chest.
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A volunteer on her campaign team said to a voter that rival Sadiq Khan was a "liability" because he is Muslim.
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The demonstration is due to take place next Saturday in central London ahead of the "emergency" meeting in Brussels to discuss the crisis.