An inquiry will be held into the contaminated blood scandal that left at least 2,400 people dead, the prime minister has confirmed.
It will establish the causes of the "appalling injustice" that took place in the 1970s and 1980s.
Thousands of NHS patients were given blood products that were infected with diseases, such as hepatitis C and HIV.
Families of those who died will be consulted about what form the inquiry should take.
It could be a public Hillsborough-style inquiry or a judge-led statutory inquiry, Prime Minister Theresa May confirmed.
The prime minister’s spokesman said: "It is a tragedy that has caused immeasurable hardship and pain for all those affected and a full inquiry to establish the truth of what happened is the right course of action to take.
"It is going to be a wide-ranging inquiry."
The spokesman said the decision to hold an investigation had been prompted by new evidence.
It’s been called the worst treatment disaster in the history of the NHS.
A recent parliamentary report found around 7,500 patients were infected by imported blood products.
Many were patients with an inherited bleeding disorder called haemophilia.
Jason says patients would not have played Russian Roulette with their lives if they had known the risks
They needed regular treatment with a clotting agent Factor VIII, which is made from donated blood.
The UK imported supplies and some turned out to be infected. Much of the plasma used to make Factor VIII came from donors like prison inmates in the US, who sold their blood.
Jason Evans was just four years old when his father Jonathan, a haemophiliac, died after being infected with HIV through contaminated Factor VIII treatment.
Enable it in your browser or download Flash Player here.Sorry, you need Flash to play this.Media captionJason Evans father died of Aids after being infected with contaminated blood
Jason recently discovered that in late 1984 – his father had raised concerns with his doctors about Factor VIII but he says he was told "there was nothing to worry about, this is sensationalism and not to pay attention to it. And he trusted his doctor".