This cyberattack on a Luxembourg state-owned internet and postal service provider caused an insanely large outage on Friday:

-40 flights were delayed after airline staff had to manually check luggage after airport systems went down
-Residents had to visit fire and police stations to request aid
-Home and work internet and phone connectivity were out for hours

https://www.luxtimes.lu/luxembourg/post-luxembourg-outage-caused-by-a-targeted-cyberattack-firm-confirms/80019668.html