Verified Twitter user Bill Mitchell @mitchellvii tweeted on March 27 that he had been in "Twitter jail" overnight but did not know why. https://twitter.com/mitchellvii/status/1243570071496265731

Twitter spokesperson indicated that account had been temporarily suspended for violating the new rules regarding COVID-19, founder here: https://blog.twitter.com/en_us/topics/company/2020/An-update-on-our-continuity-strategy-during-COVID-19.html.

The user's account was reinstated the following morning, but Twitter never let him know why the temporary suspension was enacted. Additionally, Twitter spokesperson did not indicate which Tweet it was that had violated the new rules.