YAKIMA, Wash. (AP) — The Yakima Humane Society is cutting ties with the city in southern Washington state over its ban on pit bull terriers.

The Yakima Herald-Republic reports the organization notified the Yakima City Council on Monday after officials postponed a vote on lifting the ban, which has been in place for more than 30 years.

The organization is contracted by the city to pick up stray animals and keep them for at least 72 hours. The organization also provides medical care to the animals and spays and neuters them.

Organization board president Kelly Murray says the society can no longer support enforcement of the "unsubstantiated, unjust ban."

Society director Charles Stanton says the organization will be happy to reconsider the partnership if the ban is lifted.

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Information from: Yakima Herald-Republic, http://www.yakimaherald.com