The judge in the Soham murder trial today instructed the jury that he would take majority verdicts.
Mr Justice Moses urged them to try and reach unanimous decisions. But he said he would accept verdicts based on a 10-2 majority.
He gave the instruction 30 minutes after the jurors began a fourth day of deliberations.
The seven women and five men were sent home overnight after considering the case for around 16 hours since first retiring on Friday.
Mr Ian Huntley (29) a former caretaker at Soham Village College, denies murdering British schoolgirls Holly Wells and Jessica Chapman on Sunday August 4th last year but has admitted a single charge of conspiring to pervert the course of justice.
The jury has heard he admits Holly died accidentally in his bath and that he killed Jessica as he tried to silence her screams, although he insists he did not mean to kill her.
He bundled their bodies into his car, dumped them in the remote ditch where they were found 13 days later, cut off their clothes and torched their corpses.
His ex-girlfriend Carr (26) a former classroom assistant in the 10-year-olds' class, denies conspiring to pervert the course of justice and two counts of assisting an offender.
She has told the jury that she lied to protect her then fiance, giving him a false alibi, but insisted she never suspected he could be involved in the girls' disappearance.