Detectives from the Homicide and Serious Crime Command were pictured this morning investigating the scene in Edmonton, north London, where a 19-year-old man died after reports of gunshots.
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Damon Smith from Newton Abbot was found guilty of planting a home-made bomb on the London Underground in October.
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Megan Hurley had reportedly been at the concert with her brother Bradley, 21, who remains in hospital after the terror attack.