Police investigating the disappearance of a Northland woman have examined a site near Omanaia where she reportedly crashed her car.
Barbara Ann Moka, 32, has not been seen since she left a tangi at Omanaia on 9 June.
Ms Moka's partner has told police she drove her Honda station wagon into a culvert after leaving a tangi with him, and they later walked back to the marae, after which she left without him.
The car has been towed to Kaikohe for forensic examination.
Detective Senior Sergeant Rhys Johnston said Ms Moka's partner was the last person to see her, and has been very cooperative with police, taking officers through what happened in the hours leading up to her disappearance.
He told Radio New Zealand's Morning Report programme police were keeping an open mind to all possiblities.
"Foul play is certainly one of the things we'll take into consideration and that's why we've got this team conducting this investigation."
Detective Senior Sergeant Johnston said a search and rescue team searched for Ms Moka throughout Thursday.
He said Ms Moka hasn't used her bank account or phone, nor has she updated her Facebook page which she would normally do on a regular basis.
Twelve police officers are working on the case.