Shortly before midnight on Sunday night, the National Security Council tweeted a warning about disinformation being circulated by text messages that falsely claims a national quarantine is being imposed because of COVID-19.

According to Bloomberg News, the NSC tweet was related to a cyber-attack on the computer systems of the U.S. Health and Human Services Department (HHS) on Sunday.

โ€œThe attack appears to have been intended to slow the agencyโ€™s systems down, but didnโ€™t do so in any meaningful way,โ€ Bloomberg reported.

โ€œIt doesnโ€™t appear that the hackers took any data from the systems, one of the people said. HHS officials assume that it was a hostile foreign actor, but there is no definitive proof at this time.โ€

Bloomberg said it had not yet received official comments from HHS, the NSC or the White House.