"Work is currently being carried out on soil and debris samples found in the car to identify the pollen and spores in them," says detective chief inspector Jes Fry. "These will then be compared with the results from the samples taken at Anmer."
The tests will take several weeks. "If a link is identified, it could be a significant step forward in the enquiry," Fry said.
Police and Dmitrijeva's family have appealed to the public for help in finding the woman's killer.
Courtesy Norfolk Constabulary