US customs officials inspect China-linked factories in Vietnam, Bloomberg News reports

July 27 (Reuters) - U.S. customs officials have carried out spot inspections on China-linked factories in Vietnam, Bloomberg News reported on Monday, citing people familiar with the matter.

Inspectors examined documents, raw material sources and production processes to determine how much value was added before exporting to the United States, the Bloomberg report said. Inspectors also looked at potential software intellectual property violations, it said.

While there have been concerns that the U.S. would increase and broaden tariffs against Vietnam, there isn't any significant evidence of Chinese goods illicitly transiting through the country to the U.S., according to Bloomberg.

Reuters could not verify the report. U.S. Customs and Border Protection did not respond to a request for comment.