Conservative leader Kemi Badenoch criticised what she called a missing £5bn in the defence investment plan.
Three teenage boys convicted of rape should have been detained, the Court of Appeal hears.
The Labour leadership hopeful says he will "ask the home and foreign secretaries to review all possible options".
The boy was taken to hospital to be treated for "potentially life-threatening" gunshot injuries, police said in a statement.
The National Police Chiefs' Council says said the five-day operation led to hundreds of arrests and seizures of more than £1m in cash.