The Trump administration announcement of the actions, initially expected on Tuesday, has been put off until later this week because of "scheduling issues," a CBP spokesman said.

The cotton and tomato bans along with five other import bans involving Xinjiang forced-labor abuses would be an unprecedented move by CBP and likely stoke tensions between the world's two largest economies.

The "Withhold Release Orders" allow the CBP to detain shipments based on suspicion of forced-labor involvement under long-standing US laws aimed at combating human trafficking, child labor and other human rights abuses.

President Donald Trump's administration is ratcheting up pressure on China over its treatment of Xinjiang's Uighur Muslims. The United Nations has said it has credible reports that 1 million Muslims have been detained in camps in the region, where they are put to work.

China denies mistreatment of the Uighurs and says the camps are vocational training centers needed to fight extremism.

CBP Executive Assistant Commissioner Brenda Smith told Reuters that the effective import bans would apply to the entire supply chains involving cotton, including cotton yarn, textiles and apparel, as well as tomatoes, tomato paste and other products exported from the region.

"We have reasonable but not conclusive evidence that there is a risk of forced labor in supply chains related to cotton textiles and tomatoes coming out of Xinjiang," Smith said in an interview. "We will continue to work our investigations to fill in those gaps."

US law requires the agency to detain shipments when there is an allegation of forced labor, such as from non-governmental organizations, she said.

The bans could have far-reaching effects for US retailers and apparel producers, as well as food manufacturers. China produces about 20% of the world's cotton and most of it comes from Xinjiang. China also is the world's largest importer of cotton, including from the United States.

'Abusive working and living conditions'

In March, US lawmakers proposed legislation that would effectively assume that all goods produced in Xinjiang are made with forced labor and would require certification that they are not.

In July, Washington issued an advisory saying companies doing business in Xinjiang or with entities using Xinjiang labor could be exposed to "reputational, economic, and legal risks."

The State Department also said it sent a letter to top American companies including Walmart Inc, Apple Inc and Amazon.com Inc warning them over risks faced from maintaining supply chains associated with human rights abuses in Xinjiang region.

In a draft announcement seen by Reuters, the CBP said it identified forced-labor indicators involving the cotton, textile and tomato supply chains "including debt bondage, unfree movement, isolation, intimidation and threats, withholding of wages, and abusive working and living conditions."

The agency's orders would block cotton produced by the Xinjiang Production and Construction Corps, and apparel produced by Yili Zhuowan Garment Manufacturing Co Ltd and Baoding LYSZD Trade and Business Co Ltd. It says those entities use prison labor from Chinese government administered "re-education" internment camps. In addition, the proposed CBP orders would block imports of products made at the Lop County Industrial Park as well as the Lop County No. 4 Vocational Skills Education and Training Center. The moves follow the detention on July 1 of hair extensions and other goods from the Lop County Meixin Hair Product Co..

The CBP orders would also block imports of computer parts made by the Hefei Bitland Information Technology Co Ltd, based in Anhui, China.

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