JoNel Aleccia of NBC News reports some 500 dogs and nine cats may have died after eating chicken jerky pet treats made in China, according to updated complaints logged by federal veterinary health officials.

A new tally of reports filed with the Food and Drug Administration shows the agency has received 2,674 reports of illness involving 3,243 dogs, including 501 deaths. The agency also has received reports of nine illnesses in cats, including one death, the FDA said.

That’s up from an estimated 2,200 reports of illness, 360 dog deaths and one cat death reported last summer. So far, though, FDA has not been able to confirm a link between the treats and the ailments. 

The new figures come less than a week after two of the largest retailers of pet chicken jerky treats issued voluntary recalls of several popular brands after New York state agriculture officials detected unapproved antibiotics in the products.

Nestle Purina PetCare Co. recalled its popular Waggin’ Train and Canyon Creek Ranch brand dog treats, and Del Monte Corp. officials recalled their Milo’s Kitchen Chicken Jerky and Chicken Grillers home-style dog treats from shelves nationwide.