The head of Thames Valley Police has said his force is considering legal action against the Government over the early release of Pc Andrew Harper's killers. Mr Hogg has urged the Government to reconsider the decision, saying Thames Valley Police was taking legal advice to explore whether it could challenge the decision in the courts. Chief Constable Jason Hogg has spoken of the effect on his police officers of the early release of Pc Harper's killersAfter Pc Harper's death, a law was introduced so that those who killed an emergency worker who was on duty received a mandatory life sentence, but it is not retrospective. On Tuesday, Aileen O'Connor, the chairman of the Thames Valley Police Federation, told The Telegraph's Daily T podcast: "This is not justice. "I am against early release of this dangerous category of rapists, paedophiles, killers, including the killers of Pc Harper."