The families of the victims of the Birmingham pub bombings are renewing their call for a public inquiry on the 50th anniversary of the atrocity.
A silence will also be held on Thursday in the city centre to remember the 21 people killed in 1974. An inquest in 2019 decided that they were murdered by the IRA.
Julie Hambleton, whose sister Maxine died in the attacks, said there were still so many questions - and only a public inquiry would deliver answers.
"Why would anybody want to cause such havoc, horror, trauma, carnage to so many people, why?" Julie asks.
"What was the bomb made of? Were there informers? Were there pre-warnings? Who were the perpetrators?".
182 people were also injured when the two bombs exploded in two city-centre pubs. A third device was recovered, but West Midlands Police lost it.
Six Irishmen, known as the "Birmingham Six", were wrongly convicted over the attacks and freed in 1991 after 16 years in prison.
Over the decades various names have been linked to the bombings.
Although police re-investigated, last year they decided there wasn't enough evidence to bring any criminal charges.
Julie, who set the campaign group Justice for the 21, told Sky News: "We cannot allow murderers who continue to breathe to continue to have their liberty."
Read more on the Birmingham bombings:
Botched IRA warning call led to 21 deaths, jury finds
Julie at inquest: 'More angry now than ever'
Following the bombings, the Irish community in Birmingham faced a backlash.
Maurice Malone, who was aged 7 at the time, says his father was attacked and lost his job, as did others.
He said: "Mum just explained to me that something had happened in the city the night before and Irish people were now a figure of hate in our city and people who were our friends, family members, relatives, people who used to visit us quite regularly didn't want to know us anymore."
Maurice helped to fundraise for a permanent memorial to the victims to ensure the bombings - which are the biggest unsolved mass murder in modern British history - are never forgotten.
(c) Sky News 2024: Birmingham pub bombings: On the 50th anniversary of the atrocity, families of the v
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