The government has announced a public inquiry to investigate the deaths of the victims of the 2017 Manchester Arena attack.
The inquiry will be chaired by Sir John Saunders, a retired High Court judge who lead the investigation and inquest into the 22 deaths.
In September, Sir John ruled that he could not go ahead with the hearing because the government refused to allow secret material to be made public.
On Tuesday, Home Secretary Priti Patel said the decision to hold an inquiry was made after "careful consideration" of Sir John's advice that inquest proceedings should be adjourned and an inquiry established so that all relevant evidence can be heard.
In his September ruling, Sir John cited a risk to national security after granting an application by Ms Patel to exclude key intelligence material.
It will be the first time an inquiry into a terrorist attack since 9/11 has happened partly behind closed doors.
The decision means the families will never know the full details of why MI5 failed to stop the attack.
In a statement, Ms Patel said: "It is vital that those who survived or lost loved ones in the Manchester Arena attack get the answers that they need and that we learn the lessons, whatever they may be.
"This process is an important step for those affected as they look to move on from the attack and I know that they want answers as quickly as possible.
"I am determined to make this happen, while ensuring the proper processes are followed.
"Now that the coroner has decided that an inquest cannot properly investigate the deaths, I have agreed to establish an inquiry to consider all the information so that he can make appropriate recommendations."
The Home Office said specific arrangements for the inquiry will now be a matter for the chair.
It continued: "The Home Office will provide support and ensure that the inquiry has the resources that it needs."
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