Exclusive: U.S. considers blacklisting more oil tankers over Venezuela trade, official says

LONDON/NEW YORK/WASHINGTON (Reuters) - The United States is considering imposing sanctions on dozens of additional foreign oil tankers for trading with Venezuela, a U.S. official told Reuters on Friday.Some of the sanctions announcements could come in the near-term while others could be imposed over a longer period if the activities persisted, the official said on condition of anonymity.Earlier on Friday, four shipping sources told Reuters that potential sanctions on at least 40 various ships..