Hundreds of thousands of previously unseen official documents about the Hillsborough disaster in 1989 are being released today.
Trevor Hicks, who chairs the Hillsborough family support group, said that they simply "just want the truth".
"It is harrowing, it is difficult... but the unknown is more difficult to cope with that the known," he told the Today programme.
Pamela Dix, executive director of Disaster Action, said that it is often the case in many disasters that authorities display a "lack of desire [to] get to the bottom of what happened".
She said that without a "thorough honest investigation" it will be hard to "prevent future disasters from happening".
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