The woman was taken to Whangārei Hospital with serious injuries to her head and body, and is in a stable condition.
Minutes after the alleged assault, police were notified of an alarm activation at the Paihia Police Station, where a man was immediately arrested by police.
He had allegedly smashed his way into the front of the station with a brick and smashed through another internal door before gaining entry into the office area, where he damaged the internal alarm that was sounding.
He was located by police inside the building. The same male is believed to have been involved in both incidents.
Whiu said the station was not open at the time the incident occurred and there is no tactical equipment stored on site.
The damage is being repaired and the police will be conducting a review to establish whether any improvements can be made.
As part of ongoing inquiries, the police would like to hear from anyone in the vicinity of Selwyn Mall, Selwyn Rd, or Williams Rd who saw what happened, or recall seeing a male acting suspiciously in Paihia township during the day and prior to these events.
If you can help, please contact the police on 105 and quote file number 230730/5703.