Police have widened their search for Whanganui woman Marice McGregor to the Manawatu after evidence her cellphone was switched on in the region a day after she vanished.

The family of a woman missing for 12 days say they are going through a "slow living nightmare" as police admit something untoward may have happened to her.

Police investigating the disappearance of a Whanganui woman 12 days ago are seriously concerned "something untoward" has happened to her and are appealing for sightings of a green van.

Police name a soldier killed when his motorbike hit a car outside the Linton Military Camp today.