BBC News' sports news correspondent Dan Roan has tweeted:
BREAKING FA Chairman apologises: "We are deeply sorry this tragedy occurred at a stadium the FA selected...I offer a full apology.."
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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.