Kansas City, Mo. ? Two Chinese businesses and a U.S. company were indicted Wednesday in the tainted pet food incidents that killed potentially thousands of animals last year and raised worries about products made in China.

Xuzhou Anying Biologic Technology Development Co., Suzhou Textiles, Silk, Light Industrial Products, Arts and Crafts I/E Co., and Las Vegas-based ChemNutra Inc. were charged in two separate but related indictments.

The U.S. attorney’s office in Kansas City said the U.S. Food and Drug Administration has received consumer reports suggesting 1,950 cats and 2,200 dogs died after eating food contaminated with the toxic chemical melamine.

U.S. Attorney John F. Wood told reporters that authorities haven’t been able to substantiate those reports, but “as for pet deaths, we think it’s in the thousands.”

One of the indictments charges Xuzhou Anying Biologic, located in China’s Jiangsu Province, and Suzhou Textiles, in Suzhou, China, with 13 felony counts of introduction of adulterated food into interstate commerce and 13 felony counts of introduction of misbranded food into interstate commerce.

The indictment also names Mao Linzhun, Xuzhou’s owner, and Zhen Hao Chen, Suzhou’s president.

ChemNutra and company owners Sally Quing Miller, a Chinese national, and her husband, Stephen S. Miller, were charged with 13 misdemeanor counts of introduction of adulterated food into interstate commerce, 13 misdemeanor counts of introduction of misbranded food into interstate commerce and one felony count of conspiracy to commit wire fraud.

The indictments allege that Suzhou Textiles, an export broker, mislabeled 800 metric tons of tainted wheat gluten manufactured by Xuzhou to avoid inspection in China. Suzhou then did not properly declare the contaminated product it shipped to the U.S. as a material to be used in food, the indictment says.

It also says the shipment was falsely declared to the Chinese government in a way that would avoid a mandatory inspection of the company’s plants.

“The defendants intended to deceive the Chinese government in addition to consumers,” Wood said.

According to the indictment, ChemNutra picked up the melamine-tainted product at a port of entry in Kansas City, then sold it to makers of various brands of pet foods. The indictment alleges that Xuzhou added the melamine to artificially boost the protein content of the gluten to meet the requirements specified in Suzhou’s contract with ChemNutra.

Wood said adding the melamine, which would allow it to pass chemical inspections for protein content, was cheaper than actually adding protein to the gluten.