Police in Scotland have been searching for 28-year-old John Yuill and 25-year-old Lamara Bell since they were reported missing.
Injured woman found three days later beside dead man in crashed car
A woman was found in a critical condition next to a dead man in a car – three days after the crash.
The couple were last seen in the company of friends on the south shore of Loch Earn, Stirlingshire, in the early hours of Sunday.
A call was made to police late on Sunday morning about a car which was reported as being off the road on the M9.
However, it has emerged that this was not followed up.
A separate report was made just before 10am on Wednesday.
The matter has been referred to the PIRC by the Crown Office.
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