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Police want to hear from women who have met a man calling himself "Houndman" on internet dating websites.
The 40-year-old Huntly man has been charged with rape and sexual violation of two women he met on separate occasions through a New Zealand dating website.
Detective Simon Everson, of Waihi CIB, said the man had been using the website for 2-1/2 years, and police believed there could be further victims.
Mr Everson has warned people to be careful when using online dating services.
The first alleged attack happened on November 9 and the second victim was attacked on November 23.
"On both occasions the women have met the man and returned to his rural home outside of Huntly where the alleged offences have been committed," Mr Everson said.
The man used the pseudonym Houndman in both cases.
"We would be interested in hearing from anyone who may have had contact with a person using this identity."
The man was arrested on November 29, and remanded on bail to appear in Huntly District Court on January 18.
Mr Everson said when using internet dating sites, people should use basic safety precautions.
"When meeting with someone for the first time meet in a public place, such as a cafe or restaurant.
"Inform someone where you are going and who you are meeting," he said.
- NZPA