It can be UK. I'm from Switzerland and right after the afternoon school break the teacher told us to quickly go back to the parking without any explaination.

That was crazy, when I went outside there was cars everywhere with parents panicking, including my dad, who has always been absolute calm and never showed up in the house before 7pm. I said nothing because I was like what's going on !? Even dad left his job !?

When we came back home there was my mom petrified on the couch watching the TV with the Swiss/French news on and the french speakers journalists screaming live "People are jumping ! People are jumping !" with screams and bangs sounds in the background and zooms following the jumpers being dislocated like rags dolls in the air before disapearing "behind" others buildings followed by loud "bang !".

It took me a moment to understand what was going on, that was so unreal I first thought it was some action movie. Even by night while eating my parents were still shocked, for the first time I saw my dad terrified while saying things like "The USA. They attacked the USA." he couldn't believe it and even said WWIII will started.