Police have made a further arrest in connection with the murder of the Northamptonshire teenager Sarah Benford.
A 41-year-old woman was arrested at a house in the town and is due to be interviewed later.
Sarah Benford, 14, went missing from a care home in Northampton over three years ago.
Two months ago the police announced that the search for Sarah had become a murder inquiry, because they had no proof she was alive.
Police said she had been involved in the world of drugs and prostitution.
On Thursday, Northamptonshire Police arrested the 41-year-old woman at a house in Kettering as part of the ongoing investigation.
Four men and one other woman have already been arrested in connection with the inquiry and remain on police bail.
Sarah, who is originally from Kettering, became one of the UK's most well-known missing teenagers after her face was used to re-launch a website for missing children in March last year.