A CPS spokesperson said:
“The CPS has been looking at eight cases of FGM, four of which are re-reviews of previous cases and four are new cases that have been referred to us for consideration and which we have been liaising with police on.
“We have now determined that no further action should be taken in relation to one of the new cases, in which it was alleged that the victim’s mother had arranged for her to undergo female genital mutilation in Kenya in 2006.
“The case was referred to the CPS in January 2013 and after very careful consideration of the case, we have concluded that there is insufficient evidence for a realistic prospect of conviction.
“This was a very sensitive case, in which the victim withdrew her allegation. We offered her specialist support and special measures but she was no longer willing to support a prosecution.
“Careful consideration was given as to whether a witness summons may have been appropriate in this instance and we took into account the information provided by the victim, police and social services in relation to the victim’s vulnerability.
“In light of the information provided, we concluded that it would not be appropriate to apply for a witness summons, as to do so could lead to a real risk of harm to the victim’s health.
“This was not a decision that was reached lightly, as the evidence of the victim was crucial to a prosecution. Without the victim we were unable to proceed and we have therefore advised the Metropolitan Police that no further action should be taken in this case.
“The CPS remains committed to tackling FGM, which is a key priority for the organisation. We are still considering seven other cases, all of which will be reviewed on their own facts and merits.
“We also continue to make wider progress on the DPP’s FGM action plan, published in November 2012, working closely with police and other agencies to ensure we take whatever steps possible to tackle the challenges of investigating and prosecuting cases of FGM. As part of this, last week, CPS London and the Metropolitan Police Service signed a protocol setting out best practice for police and prosecutors in cases involving FGM to ensure a thorough and consistent approach is taken to all investigations and prosecutions.”