Amazon's counterfeit problem is getting worse and expanding to more sites owned by the company, according to a major retail industry advocacy group.

The American Apparel & Footwear Association, which represents more than 1,000 brands, wrote in a letter to the U.S. Trade Representative on Monday that two more Amazon sites — its marketplaces in France and India — should be added to its annual list of "Notorious Markets," which identifies sites and companies that facilitate the sale of counterfeit goods. The trade group recommended three Amazon sites in the U.K., Germany, and Canada, to the list last year for the first time.

"Despite its role as a leader in the worldwide retail landscape, and as an important selling partner for many of our member brands, Amazon continues to present significant counterfeit challenges," the letter said. "Thus, we felt it was necessary to again ask USTR to list Amazon."

The letter reflects the growing concerns around the availability of counterfeit goods through Amazon's third-party marketplace, which has gained steam in recent years after the company opened up its marketplace to third-party sellers from around the world. Amazon has launched a number of new programs to address the issue, but its online marketplace continues to suffer from counterfeit products, putting average consumers at risk of purchasing fake, or in worst cases, unsafe products.

An Amazon spokesperson said the company is "committed to eliminating counterfeits from its store," and pointed to several programs meant to help solve the problem, including a Brand Registry that offers automated tools to help spot fakes, and a project called Project Zero that uses artificial intelligence to help brands spot counterfeits and remove them.

AAFA said in the letter that Amazon has been actively engaged in discussions with the group over the past year and has launched a number of new programs to address the issue. But it said the company needs to do more to build a cleaner marketplace.