Andy Burnham is considering blocking the early release of PC Andrew Harper's killers after he previously said there was nothing he could do about their freeing. PC Harper's ankles were caught in the car's tow rope and he was dragged along the road at 43mph for over a mile. As Cole and Bowers have served half their sentence, they would be eligible for early release under Labour's plans. A possible U-turn has now been floated with a Government source confirming last night the Prime Minister was prepared to "explore every option" to keep PC Harper's killers in prison, according to The Telegraph. A Thames Valley Police spokesman said: "It is encouraging that the Government is looking carefully at the early release scheme.