A container of human excrement was splattered in a Kapiti house, in what one woman claims was a violent attack.

Kapiti senior sergeant Anita Dixon said police attended an incident where human waste was thrown through a house, on Tuesday, January 27.

Dixon said police understood the parties involved had been drinking together before the incident occurred.

An unnamed woman claims two women she knew, who had gang associations, came into the Paraparaumu house of a friend she had been visiting last week with a bucket of human faeces.

She said the pair threw the contents about and smeared it on the walls and on the occupant of the house and that she ran out the back of the house, but the pair caught her on the driveway.

The women smashed her head into the driveway and stomped on her head repeatedly, and scratched her, she said.

Dixon said police were not aware of an assault.

"There was apparently a mixture of poo and water thrown around a room, not at a person," she said.

Police had investigated the scene the following day and had encountered differing stories in interviews. No charges had yet been laid.

The woman said she was treated by an ambulance in a nearby street after she escaped her attackers.

Wellington Free Ambulance head of communications Diane Livingstone confirmed ambulance staff had attended the incident, but declined to say whether a patient had been treated or transported.