What just caused/causing this selloff 4/22/2021

I honestly have no idea what just caused that sudden daily drop. I’m not a day trader and don’t watch in the moment news as my systems don’t really use it. I just happened to notice this while working on things today, and I am curious what may have caused this. Anyone know or have a theory?

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Perhaps the culprit is this: Stock Market Today: Dow, S&P Live Updates for Apr. 22, 2021 - Bloomberg

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