The murder of a 14-year-old girl by her father could not have "reasonably been foreseen or prevented by any agency", according to a serious case review published last week.

Carry Ann Brown, who had a learning difficulty, died last August after her father abducted her from foster carers employed by Blackburn with Darwen social services and then deliberately crashed the car they were in.

Sean Brown, who was given a life sentence at Preston Crown Court for murder and unlawful sexual intercourse last month, committed the act to try and conceal the fact he made his daughter pregnant.

Social workers had become aware that Brown was sleeping in the same bed as his daughter and had advised him to stop, although he claimed it was necessary because she had fits.

Social services placed Carry Ann with the foster carers after discovering she was pregnant and suspecting Brown was the father. A few days later the pregnancy was terminated.

The report, commissioned by Blackburn with Darwen area child protection committee, says it would have been difficult to ensure that Brown had stopped sleeping with his daughter because further evidence was needed and Carry Ann had made no allegation of sexual abuse.

Among other things, clearer guidance for social services and police about how to manage contact visits for children in care who have been abused by parents is needed, says the report written by former Trafford Council social services director Ian Rush.