Hackers briefly took over Twitter CEO Jack Dorsey’s account, tweeting bomb threats and racist posts and served as a reminder of the relative ease of compromising security.

“The phone number associated with the account was compromised due to a security oversight by the mobile provider,” Twitter tweeted Friday. “This allowed an unauthorized person to compose and send tweets via text message from the phone number. That issue is now resolved.

The company also said “there is no indication that Twitter’s systems have been compromised.”

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