So either this was a security breach, a human mistake or a psyops/test on a small isolated American population. In the first case, we'll probably only be told about it if they actually make an arrest and the system is patched. The second is an interesting case, we'll come back to. The final one: it was intentional and used to track what happened on the islands, and to also watch that information propagate back to the…
If there is anything nefarious here (seems like it), this is the work of a foreign state actor probing our infrastructure for exploitable weaknesses and sizing up our response. I'll put my money on Russia, who has already been attacking our elections¹, energy infrastructure², social media, and spearphishing candidates and elected officials³.
They have conducted similar attacks in the past, sending out tweets and text message alerts to hundreds of people for nonexistent emergencies⁴.
[1] https://www.bloomberg.com/news/articles/2017-06-13/russian-b...
[2] https://www.washingtonpost.com/world/national-security/russi...
[3] https://www.secureworks.com/research/threat-group-4127-targe...
[4] https://mobile.nytimes.com/2015/06/07/magazine/the-agency.ht...