The government advisor on safety at sports grounds is 'concerned' by reports of overcrowding at Hillsborough during the FA Cup third round tie between Sheffield Wednesday and Newcastle on Saturday.
The Sports Grounds Safety Authority (SGSA) revealed it will begin a review, after Newcastle fans claimed on social media there was a lack of stewarding in the Leppings Lane End before kick-off and that they were crammed in.
The Football Association will also look into the reports. 97 Liverpool supporters died after a crush in the stand in April 1989, during their FA Cup semi-final tie against Nottingham Forest.
"We are concerned by reports of overcrowding and crushing at the FA Cup tie between Sheffield Wednesday and Newcastle United at Hillsborough Stadium on Saturday," said an SGSA spokesperson.
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"The SGSA is now working with the club, Sheffield City Council and the Safety Advisory Group to review the event, learn any lessons and ensure a safe environment for football fans."
The FA will speak to officials from both clubs, as well as to the police and safety authorities about the incident. 4,500 Newcastle fans were in the Leppings Lane End, and the Newcastle United Supporters' Trust has called on anyone involved to contact them with details of their experience.
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