Detectives have called in specialist forensic scientists to examine items in the house at Hanover Street where missing teenager Caroline Graham lived.
Yesterday the house was subjected to a detailed examination by two PSNI victim recovery dogs.
As a result of indications by the dogs, forensic scientists have been asked to examine certain items in the property.
The search continued today and is expected to run into a third day.
Police are repeating their appeal to anyone with information about 19 year old Caroline, her murder or where her remains are buried. She disappeared in 1989. Anyone with information can contact detectives on 02890 700 727 or 07585 22 82 83