The child was taken to Airedale General Hospital by ambulance where he was pronounced dead.
A murder investigation was launched by West Yorkshire Police's Homicide and Major Enquiry Team and at 11:30am this morning and a 32-year old man was arrested from an address in the Ingrow area of Keighley.
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Former Police Inspector Harry White told the inquests that he was told that fans entering the terraces should "find their own level."
A former police inspector has told the inquests he realised fans entering through an exit gate would head towards already crowded pens.