U.S. customs officials have inspected China-linked factories in Vietnam, checking documents, materials and production processes to verify value-added content and potential software intellectual property violations, Bloomberg News reported Tuesday.
The probes heighten fears Washington may expand tariffs on Hanoi amid delicate trade talks, according to the report.
No significant evidence of Chinese goods transshipping through Vietnam has been found yet, Bloomberg wrote.
U.S. Customs and Border Protection and Vietnam's Ministry of Foreign Affairs did not immediately respond to' requests for comments.
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