A group identifying itself as the "ISIS Cyber Caliphate" successfully hacked into Newsweek's Twitter account early Tuesday, posting a threatening message to President Barack Obama, the first lady and their two young daughters.

According to the New York Daily News, in a posting captioned, "Bloody Valentine's Day #Michelle Obama," the group said, "We're watching you, your girls and your husband."

The group also declared "Je suIS ISIS," on the site's homepage, in an image uploaded as the header picture for the publication's Twitter profile.

In stressing they had regained control of their account, Newsweek officials added, "We can confirm that Newsweek's Twitter account was hacked this morning, and have since regained control of the account. We apologize to our readers for anything offensive that might have been sent from our account during that period, and are working to strengthen our newsroom security measures going forward."

White House Press Secretary Josh Earnest later told USA Today the FBI is now investigating the situation for clues.

"I don't have any response to the claims that are made by these hackers," he said. "I can tell you we've seen a number of high profile incidents over the past months."

Last month a group reported to be the same outfit hacked into the Twitter account of the U.S. Central Command and compromised the feeds of a variety of other entities. Twitter has declined to comment on any of the attacks.

Earnest also used the situation to urge Congress to pass a cybersecurity bill advocated for by the administration.

In touting the bill back in January, the president announced "in this interconnected, digital world, there are going to be opportunities for hackers to engage in cyber assaults both in the private and public sector. Our first order of business is making sure that we do everything to harden sites and prevent those kinds of attacks from taking place."

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