The mother of murdered child James Bulger said the Parole Board had made the "wrong decision" by moving to release one of her son's killers.
Denise Fergus said Jon Venables had shown he was still "a danger to himself and to the public".
She received a call from the Probation Service telling her that Venables, now 30, had been cleared for release for a second time.
He returned to jail in 2010 after his parole was revoked, following the discovery that he had accessed indecent images of children. Venables admitted the offence and was jailed for a further two years.
He had previously been sentenced to life alongside Robert Thompson for the 1993 murder of 2-year-old James, who was beaten to death after being taken by Venables and Thompson, then both aged 10, from a shopping centre in Merseyside.