By Marianna Parraga and Jonathan Saul

HOUSTON/LONDON, Dec 10 (Reuters) – More than 30 U.S.-sanctioned oil vessels doing business in Venezuela could face punishment by Washington after the Coast Guard seized a supertanker carrying Venezuelan crude for export, according to shipping data.

The seizure, announced by President Donald Trump on Wednesday, was the first of an oil cargo from ‍Venezuela, which has been under U.S. sanctions since 2019, and the Trump administration’s first known action against a Venezuela-related tanker since he ordered a massive military buildup in the region.

The U.S. action, as Trump ratchets up pressure on the government of Venezuelan President Nicolas Maduro, has put many vessel owners, operators and shipping agencies on alert, with many reconsidering whether t

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