Lord Hermer KC said on Friday: "It was understandable that we received multiple requests to review the sentence under the unduly lenient sentence scheme, which is designed to identify and remedy gross errors made by judges.
Rudakubana, who was 17 at the time, killed Alice da Silva Aguiar, nine, Bebe King, six, and Elsie Dot Stancombe, seven, and attempted to murder eight other children, who cannot be named for legal reasons, class instructor Leanne Lucas and businessman John Hayes.
The Southport child killer's sentence will not be referred to the Court of Appeal under the unduly lenient sentence scheme, the Attorney General has said.
"After careful consideration of independent legal advice and consultation with leading criminal barristers and the Crown Prosecution Service, I have concluded that this case cannot properly be referred to the Court of Appeal.".
Axel Rudakubana, 18, was jailed for a minimum of 52 years in January, after murdering three girls at a Taylor Swift-themed dance class in July last year.
