BBC News looks at five significant errors that could have helped prevent the deaths of 96 Liverpool fans.Read more
BBC News Online
MPs will debate the issue of safe standing at football games today after more than 100,000 people signed a petition calling for it to be allowed at Premier League and Championship matches.
All-seated stadiums was one of the the recommendations made in the Taylor report into the Hillsborough disaster in 1989, which claimed the lives of 96 Liverpool supporters.
Six men including former police chief David Duckenfield have begun a legal bid to prevent them being prosecuted over the Hillsborough Disaster.
They have asked a judge at Preston Crown Court to halt any future prosecutions by claiming they are an abuse of the legal process.
A legal order imposed in 2000 would have to be lifted before Mr Duckenfield can face manslaughter charges.
The hearing is expected to last up to two weeks.
A spokeswoman for the Hillsborough Family Support Group has said she is surprised the group was not consulted by the Labour Party ahead of its decision to back safe standingat larger English football stadiums.
Shadow sports minister Dr Rosena Allin-Khan has called for decisions on safe standing to be devolved to clubs, fans and safety authorities.
Margaret Aspinall said it was a "sensitive time", with ongoing legal action regarding the disaster, and most Hillsborough families "don't want standing ever brought back".
Clubs in England's top two tiers have been required by law to have seating since the 1989 disaster.
Labour has announced its backing for safe-standing at football grounds.
Clubs in England's top two tiers have been required by law to be all-seater since the 1989 Hillsborough disaster.
Supporter groups are pressing for safe standing to be introduced in "rail seats", which can be locked in an upright position.
In April some Liverpool fans visited Celtic's stadium to witness safe standing in action and said they found the experience "overwhelmingly positive".
The club has previously described the issue as "uniquely complex".
Shadow sports minister Dr Rosena Allin-Khan is calling for decisions on safe-standing to be devolved to clubs, fans and safety authorities ahead of a parliamentary debate on 25 June.