Although two Japanese news dailies have reported of the raid, clarity on the suspected violation is still to emerge.

On Thursday, A spokesperson for Amazon Japan stated it has been raided by Japan’s fair trade regulator on suspicion of a possible anti-trust violation.

Although the spokesperson said Amazon Japan was fully cooperating with the Fair Trade Commission, the person declined to comment or elaborate on the detail of the suspected violations.

However, Japan’s Kyodo news agency has reported citing sources familiar with the matter at hand as saying, Amazon Japan is suspected of possibly requesting its suppliers to shoulder part of the cost incurred from selling their products at a discount on its website.

Japan’s Asahi news daily also stated Amazon Japan may have demanded suppliers to pay a “collaboration fee,” a percentage of the selling price of the product to Amazon Japan.

The Japan Fair Trade Commission declined to comment on the case.