"We would like to make it clear that officers who worked on a particular missing person case in West Yorkshire are not involved in the investigation to find Tia Sharp.
"Media speculation around other missing children cases is extremely unhelpful and diverts attention away from our desire to trace Tia.
This remains a missing person inquiry and we are keeping an open mind about the circumstances of Tia's disappearance."
Police have launched a murder inquiry after a body was found at the home of Tia Sharp’s grandmother.
The worried family of Tia Sharp have renewed their pleas for her to return home as the search for the missing schoolgirl reaches one-week.
Police from the force that investigated the kidnapping of Shannon Matthews are now involved in the search for missing schoolgirl Tia Sharp