I don't know how many people are aware of this outside of the UK, but today (15th April) marks the 20th anniversary of the Hillsborough Disaster, a fatal human crush which occured during an FA Cup Semi-Final match between Liverpool FC and Nottingham Forest FC at the Hillsborough Stadium in Sheffield. It caused the death of 96 Liverpool fans, the youngest victim being a 10 year old boy.
I won't go into detail about it but if you're interested see here.
The inquiry into the disaster, the Taylor Report named the cause as failure of police control, and resulted in the conversion of many football stadiums in the United Kingdom to all-seater and the removal of barriers at the front of stands.
A memorial will be held today at Anfield (home of Liverpool FC), and there will be a two minutes' silence at 3:06pm British Summer Time to pay respects the 96 who tragically lost their lives.