Liverpool - The mother of murdered toddler James Bulger yesterday vowed to do whatever she could to prevent the early release of her son's killers. Ms Denise Bulger described Robert Thompson and Jon Venables, who were just 10 at the time of the attack, as "evil and dangerous". The pair, now 14, were given hope of an early release on Monday after the British Home Secretary, Mr Jack Straw, announced their sentence would be reviewed at the half-way stage.