Police continue their search for Greg Hutchings who disappeared with his daughter after a long custody battle with her mother.

Greg Hutchings could have taken his four-year-old daughter Eeva and disappeared because of a long custody battle with the girl’s mother, a former colleague says.

Mr Hutchings and Eeva haven’t been seen since leaving the Pottsville home of Mr Hutchings’ mother in northern NSW on Saturday.

Police on Wednesday were continuing their search for the pair.

A former work colleague in Pottsville, who didn’t want to be named, said he believed Mr Hutchings had “taken off” because of a “long-term” custody spat with Eeva’s mother Michelle Dorendahl, who wanted to return to her native Finland with the girl.

But News Corp Australia has reported that Ms Dorendahl has denied having any plans to relocate with her daughter to Finland and had made that clear to Mr Hutchings.

Mr Hutchings’ family revealed the 35-year-old may have been concerned Eeva was going to go overseas after his discovery of a secret Finnish passportf for the girl.

His sister, Sheri Hutchings, said the discovery of the passport was possibly the catalyst.

The former colleague told AAP the situation was “very sad”.

“When people are desperate for their children they do things, they take off because they don’t want to give them back, I guess.”

Mr Hutchings was further described as “a lovely guy” who had “nothing bad” about him.

Police say there are concerns for Eeva’s welfare and have appealed for Mr Hutchings to contact authorities.

A bag of the 35-year-old father’s possessions were on Tuesday seized from his mother’s Pottsville unit along with several other items, News Corp Australia reports.

Tweed Police Inspector Gary Cowan has said the father and daughter had camped in the Pottsville area before.

Local police, State Emergency Service volunteers, Queensland PolAir and water police will on Thursday continue their search between Pottsville and Kingscliff.