Wellington police are investigating the third sexual assault in the city in about a week.

This morning's alleged attack happened on Taranaki St at about 5.30am.

Police did not believe the attack was connected to an assault on Wednesday, when a man dragged a woman into the bushes on a walkway between Ohiro Rd and Brooklyn Rd at about 7pm.

Yesterday, a 40-year-old man was arrested after a sexual assault on a 65-year-old woman in Porirua last Friday.

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The Johnsonville man has been charged with rape, abduction, aggravated wounding, threatening to kill, burglary and three sexual violation offences.

He will appear in the Porirua District Court this morning.

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