A Whanganui man has been arrested over an alleged assault in the car park at Pak'n Save.
The man was arrested about 3.15pm today, Senior Sergeant Andrew McDonald said.
Police allege the man was in a car with the complainant about 11.20am on Thursday and assaulted her.
The car was in the upper parking area outside the supermarket at the time.
"A number of people witnessed the incident," Mr McDonald said.