A dead man and a seriously injured woman were found in a crashed car three days after the accident was reported to Scottish police, it has emerged.
Police Scotland found the pair in a blue Renault Clio just off the M9 near Stirling, in central Scotland, on Wednesday.
The force admitted the crash had been reported to them on Sunday morning but had not been followed up.
It is believed the two people in the car may have been John Yuill and Lamara Bell.
Mr Yuill, 28, and Ms Bell, 25, had been reported missing to police after last being seen leaving the Loch Earn area of Stirlingshire in a blue Clio in the early hours of Sunday.
It is understood the couple were both from the Falkirk area. A friend of Mr Yuill's described him on Facebook as a "great guy and a brilliant dad".
Police Scotland had launched an appeal for information about the couple on Monday afternoon.
At the time, the force said their disappearance was "completely out of character". It later released a photograph of the car they had been travelling in.
An investigation is being carried out into the incident by the Police Investigations and Review Commissioner.