North Wales Police has said a cordon around missing vet Catherine Gowing's car will remain in place for some time as a "dynamic" search takes place.
Miss Gowing's Renault Clio was found burned-out in an isolated area of Pinfold Lane, near Mold, close to a disused quarry surrounded by woodland and near to the quarry pool.
Det Supt John Hanson said the area would continue to be cordoned off while a "comprehensive search and extensive examination" takes place.
He also said specialist search teams were examining two other locations in North Wales which have not been identified.
More top news
Bodies are being buried in backyards and overwhelming morgues as officials try to find another plot of land to lay them to rest.
Authorities have warned that the death toll is likely to rise as much of the building is yet to be searched.
The PM will sound out the possibility of new free trade agreements with Gulf states for once the UK has left the EU.