Police released footage of the aftermath of an attack launched on an autistic teenager in June. Eamonn Finn sustained a slash wound to his neck, after which his mother appealed on Facebook for any more information on the assault.
The suspects are described as Hispanic or black.
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From Friday, Viagogo must publish the names and addresses of touts, those who sell more than 100 tickets a year via the site, to consumers.
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Molly Morgan fell to the ground, hitting her head and died in hospital the following day.