Five days of air and land searches across Alice Springs have failed to locate Monika Billen, a German national reported as missing in the area last week.
The 62-year-old woman has now been missing for 12 days, with witness accounts putting her last physical sighting at Emily Gap on the afternoon of January 1.
Superintendent Pauline Vicary said aerial searches will be suspended after Northern Territory Police have exhausted all locations of interest.
"In the past five days Northern Territory Police have covered vast tracks of land via aerial and land searches, said Superintendent Vicary
"Unfortunately despite our efforts no further evidence has been found to indicate Monika is still out there. Neither is there any evidence to indicate foul play.
"The last physical sighting we have for her is the Emily Gap and surrounding area, which we have thoroughly searched.
"At this stage we will suspend further aerial searches and continue to conduct enquiries to refine our search parameters."
Police continue to appeal to members of the public who may have seen Monika in these areas; Emily Gap, Ross Highway, Barrett Drive or Tunks Road, to contact them on 131 444.
"We cannot stress enough to motorists, pedestrians, cyclists – anyone who believes they may have information that may assist with our investigations," said Supt Vicary.
