On Saturday 15 April 1989, during an FA cup semi-final between Liverpool and Nottingham Forest, 96 people died.
Two memorials have been unveiled in Liverpool.
A memorial monument was unveiled on Old Haymarket in a public ceremony, attended by 300 people.
The memorial monument is a 7ft bronze structure and features the words "Hillsborough Disaster - we will remember them", along with the names
of all 96 Liverpool FC supporters who died.
The hands on its 13-inch arch dial, which features the sun and moon rising,
will be frozen at 15:06 BST, the time at which the FA Cup semi-final
was stopped in 1989.
The anniversary is also being marked with an exhibition of a 96-tile mosaic
called United for Justice, showing an image of a young Liverpool fan
shaking hands with a young Everton fan.
The Mayor of Liverpool Joe Anderson said the event was extra special,
as it was the first since the families of victims fought and won justice in their campaign.
Mr Anderson said: "Twenty-four years, the passage of time has still not dulled the pain and suffering for those of you gathered here today."
He added that the 96 were "robbed of their dignity by the people in authority"
who indulged in "lies and deceit" rather than admit their mistakes.
Margaret Aspinall, who lost her 18-year-old son James in the disaster and is chair of the Hillsborough Family Support Group, said Monday's anniversary would be "an emotional day".
She added: "I think it should also be a bit of a celebration for the fans and survivors there that day, because they went through so much and it's the first time in all these years that we have had the truth out."
For those who still suffer as a result of the events of that day, extra caring thoughts.
Take gentle care
A dreadful day - may they all RIP and their families be comforted.