BEIJING, Sept. 4 (Xinhua) -- China's Ministry of Commerce said on Thursday that it has decided to impose anti-circumvention measures on certain optical fiber imports originating in the United States, effective from Thursday.

The decision follows China's first anti-circumvention investigation, which was launched on March 4 after a request from a domestic company, said a spokesperson for the ministry.

The spokesperson added that the probe was conducted in line with relevant laws and regulations -- with open and transparent procedures that fully safeguarded the rights of all parties.

The investigation found that U.S. exporters circumvented China's anti-dumping measures concerning dispersion unshifted single-mode optical fiber by shipping cut-off shifted single-mode optical fiber products to the Chinese market.

As a result, current anti-dumping duties on dispersion unshifted single-mode optical fiber will now also be applied to cut-off shifted single-mode optical fiber products, according to the ministry.