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Cornell's veterinary school is monitoring an adult cat and three bottle-feeding kittens found in Ithaca's Collegetown neighborhood, where other cats died after a poisoning by anti-freeze, officials said.

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ITHACA, N.Y. -- Two more cats have died as the result of possible antifreeze poisoning in Ithaca, raising the death toll to eight.

Jim Bouderau, executive director for the SPCA in Tompkins County, told the Ithaca Voice on Thursday that one cat has died and another will need to be euthanized.

Since Sunday, six other cats have died after they were poisoned, the SPCA said in a news release. The group found a container of dry cat food laced with antifreeze in Ithaca's Collegetown neighborhood.

The substance in the container was clear, not bright green, as commercial antifreeze typically appears. Officials tested the cat food and found ethylene glycol.

It's not clear if the two cats that died Thursday were poisoned with antifreeze, the Ithaca Voice reported.

In addition to the deceased cats, seven other cats are being cared for by the SPCA. They too are showing symptoms of antifreeze poisoning, the Ithaca Voice reported.

All the cats came from a managed feral colony in the Collegetown area.

"Ethylene glycol is highly toxic to cats," Dr. Elizabeth Berliner of the Cornell College of Veterinary Medicine said. "Within a few hours of ingestion, cats ingesting a toxic dose will experience neurologic signs, including seizures, lethargy, and coma. Over 12 to 24 hours the signs will progress to kidney failure and death."

The SPCA considers the poisonings intentional. The investigation is ongoing.

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