We're told it was started deliberately.
LISTEN: Brother Of M9 Victim Speaks Out
The brother of an M9 crash victim's talking to Heart branding Police Scotland a "total disgrace".
Lamara Bell lay in her crashed car near Stirling for days after police failed to turn up.
It has now emerged officers left a voicemail on her phone 10 days after she died.
Martin Bell says Sir Stephen House must go.
He spoke to our reporter Connor Gillies:
Chief Superintendent John Hawkins, Forth Valley Divisional Commander, said: "Once again I want to offer Police Scotland's condolences to the Bell family."
"I am deeply disappointed that we have shown such a lack of awareness given all the briefings put in place within Forth Valley area and the media coverage reflecting the level of shock felt across the country."
"We clearly regret having caused any further upset to them."
"I have given all the details to the Bell family of why the call was made and given my, and the chief constable's, sincere apologies on behalf of the force."
Police Scotland Chief Constable Sir Stephen House has admitted police "failed both families" over its handling of the initial incident.
The police investigations and review commissioner has begun an independent investigation into the circumstances.
Scotland's Justice Secretary Michael Matheson has formally directed Her Majesty's Inspectorate of Constabulary in Scotland (HMICS) to undertake an urgent review of all police call handling following the incident.
Scottish Conservative justice spokeswoman Margaret Mitchell said: "This just underlines the chaos that is Police Scotland at the moment.
"Calls are not being dealt with correctly and simple information - which should be at people's fingertips - is clearly not being passed on at a local level."
William Burns posed as a postman.
Police and other emergency services were called to a property in Redburn, Bonhill, Alexandria, at about 12.30am on Tuesday.
Charities say the stage it's diagnosed is crucial.
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