It could have been literally any major world power, including our allies. No evidence has been presented whatsoever as to who the culprit is.
the amount of insane unfounded crap posted in HN comments is growing and i'm not sure if there is a fix.
BTW recent articles say it's microwaves
The only common element among USA facilities in Havana, Guangzhou, and Tashkent is the USA facilities themselves. Much like the situation described in TFA, those facilities were built by the most corrupt bidders. It will surprise no one when it is revealed that some corner was cut, and American personnel were exposed to harmful amounts of some ghastly chemicals, radiations, etc.
It is literally a conspiracy theory to reject this simplest possible explanation in favor of some outlandish three-way joint venture among the Cubans, the Chinese, and the Uzbeks, three nations not known for ever having done anything together.
I'm totally on board with accident/malpractice from shitty construction.
But implying or outright saying the CIA used a weapon on their own employees is crazy - without actual proof - especially to write out on HN.
Sure as pointed out below the US has done - and probably is - doing stupid things. But I really don't buy testing a WEAPON without consent