Police are searching for the remains of a newborn they suspect was murdered and buried on a rural property north-west of Sydney.
Detectives from the homicide squad said they recently received information that a child was born in late 2007 or early 2008 and was murdered and buried on a property at South Maroota.
They established Strike Force Enact to investigate the case and have been liaising with staff from the Department of Family and Community Services (FACS) and NSW Health.
That led police to a property on Cliftonville Road where officers from the public order and riot squad have been digging and conducting line searches through dense bushland.
The ABC has been told the search relates to a new investigation and is not linked to any previous cases.
Detective Chief Inspector Angelo Memmolo appealed to the public for any information that could assist with their investigation.
"An investigation into the death of a baby will always be delicate and challenging for police and this incident is of great concern to us," he said.
"We are hoping someone in the community may have information relating to the circumstances surrounding the baby's death.
"Whilst there are restrictions around what we can say publicly at this stage, we believe in these circumstances, this could be enough to spark someone's memory.
"If anyone has knowledge about the possible murder of a baby around this time, please get in touch with us."
Police said the current owners of the property were not believed to have any involvement with the suspected murder.