Police are investigating possible links between the murders of Devon schoolgirl Genette Tate and a nine-year-old girl in Northern Ireland.
Genette Tate: Police files have remained open
Devon and Cornwall Police have met officers from Northern Ireland to compare their case with the murder of Jennifer Cardy in 1981.
Reports have suggested the two forces may question convicted child killer Robert Black.
Lothian and Borders police, who caught Black in July 1990, have also exchanged information with both forces.
Black, now 55, was sentenced in 1994 to 10 life sentences for the abduction and
murder of three young girls, and the attempted abduction of a 15-year-old girl.
He was interviewed by Devon and Cornwall detectives in 1996 and 1998 but denied abducting Genette.
Genette was on her paper round in Aylesbeare, near Exeter, when she disappeared in 1978.
Her bike was found abandoned in Within Lane.
Police files have remained open on the case ever since.
In December they revealed they had found a DNA sample from a jumper which Genette's mother had kept as a keepsake.
Officers investigating the case announced they planned to search the homes and possessions of those suspected of her abduction to try to find a DNA match.
It also means her remains could be identified, if they are ever found.
Devon and Cornwall officers have met Northern Ireland police investigating the murder of nine year old Jennifer Cardy in County Antrim.
Jennifer was abducted while cycling along a country road in August 1981.
Her body was found a week later.