Police have urged the public to contact them if they know about a crime, rather than posting it on Facebook.
Police in Kerikeri made the plea after investigating reports on social media of a sexual assault at the Rainbow Falls walking track.
Posts about the alleged assault has been circulating on Facebook for several weeks.
Inspector Al Symonds said no sexual assaults in the Rainbow Falls area had been reported to police. What had been reported were incidents of "boorish behaviour" towards women walking or running on the track.
Police were planning to speak to a woman in Auckland this week about one such incident. Officers had tried to trace the rape claim back to its source to see if it was genuine. They had so far traced it through a chain of nine people but were no closer to verifying it.