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[1] https://oalexanderdk.substack.com/p/blowing-holes-in-seymour...
No.
> U.S. officials said no American or British nationals were involved.
> U.S. officials have not stated publicly that they believe the operation was sponsored by a state.
> U.S. officials who have been briefed on the intelligence are divided about how much weight to put on the new information.
> U.S. officials said the new intelligence reporting has increased their optimism that American spy agencies and their partners in Europe can find more information, which could allow them to reach a firm conclusion about the perpetrators.