(BBC) The families of the Manchester Arena attack victims have been told that any mistakes by police or security services will not be kept secret.
A public inquiry, which started in September 2020, will shortly examine whether they could have prevented the 2017 bombing, which killed 22 people.
Some evidence will be heard in closed sessions after the inquiry chairman said they could compromise security.
Lawyers for the families have called for “maximum disclosure” when possible.
Security services were aware of suicide bomber Salman Abedi from 2014, three years before the attack at the end of a concert on 22 May 2017, which also injured hundreds of people.
