Police probing the murders of Renee MacRae and Andrew MacRae 43 years ago are to drain a flooded quarry.

Officers are to carry out an investigation Leanach Quarry near Inverness in the search for their remains. 

READ MORE: Renee MacRae 'murder': Fresh bid to solve 42-year mystery of missing mother and toddler 

Renee MacRae, from Inverness, and her three-year-old son Andrew, disappeared on November 12, 1976. It is thought their remains could be buried in the 100ft quarry. 

The 36-year-old's car was found on fire in a lay-by on the A9 south of Inverness later that day.

At the height of the investigation, hundreds of police, military personnel, and volunteers took part.

READ MORE: The disappearance of Renne MacRae: A timeline of events 

Canberra bombers with heat-seeking devices flew over the Highlands hoping to pick up a reading which could indicate a body.

Divers and specialist underwater camera equipment were used to search lochans and flooded quarries.

READ MORE: It’s incredible Renee McRae’s killer is still out there, says sister 

A team of detectives have been working to "identify new lines of inquiry and develop any existing lines of inquiry".

A Police Scotland spokesman said: "Detectives investigating the murders of Renee MacRae and her son Andrew are expected to begin searching an area of interest near Inverness within the coming days.

"We are unable to comment further at this stage."