Risks associated with confining fans in pens were highlighted by the '' Committee of Inquiry into Crowd Safety at Sports Grounds '' ( the Popplewell inquiry ) after the Bradford City stadium fire in May 1985 . It made recommendations on the safety of crowds penned within fences , including that " all exit gates should be manned at all times ... and capable of being opened immediately from the inside by anyone in an emergency "
Bradford City stadium fire
Bradford City stadium fire
Hillsborough disaster