My officers acted upon concerns raised within the community and I would appeal to the public to contact the police if they have any information with regards to people who are supplying or producing controlled drugs.
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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.
The man is thought to have tied himself to the bottom of the vehicle as it travelled from Calais to Kent.