Police investigating the disappearance of Michelle Hoffman-Tamm are tonight examining an area of interest between Rotorua and Murupara.
A woman has also been arrested.
Ms Hoffman-Tamm was last seen on November 7 when she left her Philip St home on her bicycle.
Police said Significant developments in the investigation this morning led officers to a rural spot close to SH38 between Rotorua and Murupara.
That location has been secured and will be subject to forensic examination by ESR.
A house in Rotorua will also undergo forensic examination along with any other areas of significance that are identified. Police said this was expected to last a couple of days
Ms Hoffman-Tamm's red bike was also found today at a different location in a Rotorua suburb.
A 44-year-old woman has been charged with assault and will appear at Rotorua District Court tomorrow morning.
Police said Further charges were likely.
As the matter is now before the court police are unable to comment in any further detail about today's developments.
Police want to hear from anyone who was near Holland St between 6pm on Wednesday 7, November and Sunday, 11 November and in Victoria St between Sunday 11, November and Monday 12 November.
Police are particularly interested in the movements of a two-tone light-coloured Subaru Legacy stationwagon between the November 7 and 12, travelling around Rotorua or between Rotorua, Whakatane and Murupara.
Anyone with information is asked to contact Rotorua Police on 07 349 9400. Alternatively information can be provided anonymously via Crimestoppers on 0800 555111.