POLICE are continuing their search for missing Indian national Natasha Narang, last seen at Mowbray.
Ms Narang, a University of Tasmania PhD student, has been missing since October 4.
On Thursday, police search and rescue officers scoured the Tamar River after discovering some items belonging to her on its banks.
However the search, which involved a helicopter, failed to locate the 30-year-old.
Police do not suspect any suspicious circumstances in her disappearance.
Ms Narang moved to Tasmania with her husband Sandeep in November 2012.
Formerly of northern India's Punjab region Ms Narang, a Sikh, travelled here to do a PhD on Indians studying in regional Australia.
Police believe study related stress may be the reason for her disappearance.
Elders among Launceston's Sikh community have said high expectations among international Indian students often leads to stress.
A number of people have come forward to police with information about Ms Narang's whereabouts just prior to her disappearance.
One motorist said she saw Ms Narang crossing the East Tamar Highway near the northern outlet.
Police have asked anyone who may have seen Ms Narang on Friday, October 4, to contact Crime Stoppers on 1800333000 or Launceston police on 63363945.