About a week ago at The Hague, many birds died spontaneously, falling dead in a park. You likely haven't heard a lot about this because it seems keeping it quiet was the plan all along. However, when about 150 more suddenly died - bringing the death toll to 297 - some started to take notice.
And if you are looking around that park you might have seen what is on the corner of the roof across the street from where they died: a new 5G mast, where they had done a test, in connection with the Dutch railway station, to see how large the range was and whether no harmful equipment would occur on and around the station.
You can read more here.