While these accidents left victims with lasting symptoms of concussions and other brain trauma, scans showed minimal signs of injury, although doctors for some victims reported unexplained damage to the bones of the inner ear.
Some researchers suggested that Havana Syndrome was akin to mass hysteria – a cluster of brain injuries caused by fear of an attack.
But Dr. David Reiman of Stanford University published an accompanying opinion piece noting that he had been involved in previous studies that said the symptoms “are likely to be… Caused by an external mechanism“.
Most of the new reports released Sunday focused on the GRU's Unit 29155, which was involved in the attack. Nerve agent poisoning For former Russian spy Sergei Skripal and his daughter Yulia in London in 2018.
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