Explaining the boys' sentencespublished at 12:27 British Summer Time 27 September
Phil Mackie
At Nottingham Crown Court
The 13-year-old boys have been detained at His Majesty's Pleasure, which is the legal equivalent of a life sentence for a juvenile.
In theory, if the boys are considered a risk to the public they may never come out of prison.
However, if they make good progress and are considered not be a risk and behave well, they will be released - subject to the parole board agreeing - when they're 20.