Usama Ajjan (27) was last seen in Aleppo on July 13.
He was acting as a guide for Spanish journalists Antonio Pampliega, Jose Manuel Lopez and Angel Sastre, when the vehicle in which they were travelling was stopped by armed men.
Mr Ajjan has been a regular contributor to www.humanrightsnewsdaily.com, founded by Southern District Health Board communications executive director and Dunedin freelance journalist Steve Addison.
Mr Addison said Mr Ajjan's articles painted a vivid picture of life in war torn Aleppo.
Late last month, Mr Addison said he had ''very grave concerns'', not only for Mr Ajjan, but about the way in which he was likely to be treated by the people holding him.
Mr Addison was recently contacted by Mr Ajjan's family, who believed they knew which group had kidnapped him and the Spanish journalists, but they did not want to publicly identify the group yet.
''They are hoping to reach out to the group through community leaders.
''However, nothing has been confirmed,'' Mr Addison said.
''There is a small but dedicated group of people around the world, supporting Usama and looking to create awareness about his kidnapping.
''These are people who were involved in his fundraising for school supplies for children in Aleppo.''
Aleppo, which is near the northern border of Syria, had been carved up between regime and rebel forces, including Islamic State, which had kidnapped and killed some Western journalists, Mr Addison said.
It was the scene of a five way conflict between warring factions.
People were surviving among the conflict and the devastation.
He said it might take a long time for the situation to become clear, but he hoped it would eventually resolve itself.
