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Some officials believe a microwave or directed-energy device is the most likely cause.

At the time, Matthews, the C.I.A.’s Havana station chief, who later authored the “Red Sparrow” spy-novel trilogy, surmised that the Cubans had used some sort of sonic or directed-energy device to shatter the glass and ceramic items.

It was Christmas week, 1987, thirty years before American spies and diplomats reported coming under “attack” in Havana last year from what some investigators and doctors believed was a type of directed-energy device that caused injuries similar to concussions.