Police are guarding entrances to Wellington's Central Park in the suburb of Brooklyn.

A woman stabbed in a Wellington park in what police believe was a "random attack" is in Wellington Hospital with serious injuries.

On Friday evening she was in a stable condition after having surgery but her attacker was still not found.

Armed police were called to the scene at Brooklyn's Central Park at 11.45am on Friday, and the surrounding streets and entrances to the park were closed while police searched for the woman's assailant.

Detective senior sergeant Warwick McKee said the woman was walking through the park when attacked from behind by a man with a blade.

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She was taken to Wellington Hospital with serious injuries and McKee said she was having surgery on her wounds.

Police hadn't been able to get a description of the attacker, who it is believed was unknown to the victim, at this stage, McKee said.

Police confirmed the attack was not sexual in nature.

Officers were still looking for the attacker and the weapon late on Friday.

McKee said police would maintain a presence at the scene for sometime.

MONIQUE FORD/STUFF The victim was taken to hospital in a serious condition.

Brooklyn resident Marcelina Dorrell who was walking in the park on Friday afternoon said she walked there almost every day and never felt unsafe.

"This is my route, because I live up there [in Brooklyn] ... I was just kind of worried because in the news, they said there's a man on the loose and I was wondering if he's still around here."

But the news wouldn't put her off visiting the park, she said. "It's my favourite park, we come here almost everyday. I always feel safe in the park."

However, the pathways could become very dark for people walking home during the winter months, she said.

Brooklyn resident Alex Gunn, who was cycling home on Friday evening, said the news wouldn't stop him passing through.

"I feel fine going through it ... I bring my kids here a lot too."

Bad things could happen anywhere, he said. "In rural and urban spaces, you can't stop something like this happening."

Lower Hutt resident Raj Gulati said he'd never felt unsafe in the park.

The sole incident wouldn't change his route "but if it starts happening often, then I don't think [I'd feel safe]."

MONIQUE FORD/STUFF Police checking the perimeter of the park.

* Police urged anyone who witnessed the assault, or saw anything suspicious in the Central Park area, to contact police on 105. The public, particularly people walking alone, were reminded to be aware of their surroundings and call 111 immediately if they saw anything suspicious.

MONIQUE FORD/STUFF Police are blocking entrances to Central Park in Brooklyn, Wellington, after a woman was seriously injured.