Investigators say the phone, which remains missing, was active in the Athens area until around 24 hours ago, when Ms Ross was formally identified. A police source told Greek media: 'The suitcase did not belong to the victim, as she did not have any large luggage with her. Officers are poring over CCTV footage from around the building where Ms Ross was found. Ms Ross was last seen just before the alleged murder on July 15, and around the time that forensic scientists believe the crime took place. Authorities are waiting for the result of toxicological tests saying they are likely to uncover how Ms Ross died.