Nearly 1.1 million people have endorsed an online petition by environmental groups aimed at pushing Yahoo Japan to stop its sales of ivory products.

Yahoo Japan said Wednesday it is strengthening policing of illegal ivory on its online commerce site as criticism grows it is supporting a trade that fuels the slaughter of wild elephants.

A spokeswoman for the company said it prohibits sales of raw ivory and ivory products that breach a 1989 treaty largely banning the trade. Enforcement a challenge since Japan allows the sale of old ivory such as ornaments that were produced before the treaty came into effect.

“Since there is a chance some sales may be illegal we are strengthening our policies. If we find a sale was illegal we cancel it straight away,” Takako Kaminaga of Yahoo Japan’s public relations office said. “We ‘patrol’ 24 hours a day.”

She said Yahoo Japan, which is part owned by Yahoo Inc. and Softbank Corp., does not restrict sales of ivory that do not violate the law.

Nearly 1.1 million people have endorsed an online petition by environmental groups aimed at pushing Yahoo Japan to stop its sales of ivory products.

Various other online commerce sites, such as Amazon, say they have already stopped such sales or advertising.

Raw ivory is sought after for making ornate traditional seals and other decorative items. Poachers kill tens of thousands of elephants a year to meet demand for the material, despite the trade ban, according to the Convention on International Trade in Endangered Species and other groups.

A Washington, D.C.-based conservation group, Environmental Investigation Agency, said late last year that it had found loopholes and weaknesses in Japan’s ivory controls.

The group also said that the Yahoo Japan Auctions site sold more than 12 tons of ivory products, including whole elephant tusks, in 2012-2014. That site and others feature thousands of ads for ivory and ivory products.

The international environmental campaign group Avaaz addressed its petition to Yahoo CEO Marissa Mayer and Manabu Miyasaka, CEO of Yahoo Japan, and “all other companies allowing ivory sales online.”

“As global citizens, we are appalled that you allow ivory to be sold on your site/platform, fuelling elephant extinction,” it says.

“We call on you to urgently stop all ivory sales from sites/platforms in Japan and all other markets.”

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