A police guard was in place at the house where the woman was attacked.

Three people have been arrested after the assault of a 90-year-old woman in a Levin home invasion, which left her blackened and bruised.

Police detective senior sergeant Craig Sheridan said the woman was assaulted by two females, who reportedly entered her Bath St home about 4.40pm on Saturday.

The victim was taken to hospital and was in a serious condition on Sunday.

Three young women were arrested on Sunday in relation to the assault.

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WARWICK SMITH/STUFF A bunch of flowers had been left at the front of the property, with a well-wishing note.

The alleged offenders will appear in the Levin Youth Court on Monday charged with aggravated robbery. Further charges may be considered.

"We are pleased to have been able to make swift arrests to provide reassurance to the victim, her family and the wider community, who are understandably shaken by this incident," Sheridan said.

One of the woman's neighbours, who wanted to remain anonymous, arrived home to see police cars at her house. He spoke to the victim in the ambulance before she went to hospital.

"I never saw such a black eye," he said. "Her face was just black. It's bloody terrible. She spoke to me and said 'I'll be right'.

"She was sitting up and she was quite good. I've seen a few black eyes playing rugby and all the rest in my life, but I've never seen something like that before, especially in your own home."

The man, who was upset about the attack, said nothing like that usually happened in the area. He has an alarm at his house for security.

"You don't expect that sort of thing."

Items were also taken from the house, which is near the centre of Levin and Horowhenua College.

The house was cordoned off on Sunday and a police guard was in place. Parts of two rear fences were covered with cardboard or paper, which appeared to be part of the police investigation.

Flowers have been left at the front of the property, with a note offering kind wishes.

Another neighbour, Margaret Candy, came home on Saturday afternoon and saw police cars at the house.

"It is disgusting and horrible that's what's happened," she said.

WARWICK SMITH/STUFF The house in Levin where a 90-year-old woman was attacked in a home invasion on Saturday.

Candy has lived at her house for about three months since her mother moved into a retirement home. The attacked heightened her worries about security.

"What scares me the most is my mother used to live in this unit. She would quite often go into her room and go to sleep and leave the place unlocked."

She said it was a safe area but always made sure the doors were locked.

Another neighbour, who also wanted to remain anonymous, said what happened was horrible and she was angry at what happened.

She said it wasn't a raucous area.

"The whole district is really upset."

Police were not looking for anyone else involved in the incident.