Concerned Christchurch residents have been monitoring a woman with a reported history of harming local cats.

A 400-strong Facebook community dubbed this woman the 'harmful cat feeder' and claim she's feeding their pets questionable food and making them sick- or worse.

One resident, Kate Russell, says this woman has been creating problems for years, but her behaviour has intensified over the last 18 months.

"She has been told again and again, to the extent that people have put signs up on their property asking her not to feed, which she rips down. Local businesses and local medical centres have signs in their windows- she has no permission at all from anyone."

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