Twitter CEO Jack Dorsey’s account sent out racist and inflammatory tweets including “Hitler is innocent” after it was hacked.

His account also tweeted that Twitter’s headquarters is “blowing up” as well as re-tweeting a tweet saying “Nazi Germany did nothing wrong.”

The tweets were up for about a half hour before they were removed.

Dorsey has 4.2 million followers.

“We’re aware that @jack was compromised and investigating what happened,” Twitter’s communications department tweeted on Friday night. It later tweeted that the account was “now secure.”

Twitter has been accused of being unable to control hate speech and harassment on its platform. It is not the first time that Dorsey has been hacked.

We’re aware that @jack was compromised and investigating what happened.

— Twitter Comms (@TwitterComms) August 30, 2019