Four years after the first Havana Syndrome cases emerged, the US still doesn't know who is behind the attacks on diplomats and intelligence officers.

<p>Four years after the first Havana Syndrome cases emerged, the US still doesn't know who is behind the attacks on diplomats and intelligence officers.</p>

Get the top news stories and the day's weather forecast from the Rochester Democrat and Chronicle every morning.

<p>Get the top news stories and the day's weather forecast from the Rochester Democrat and Chronicle every morning.</p>