Hackers took control of a FoxNews.com Twitter account on Monday and sent six false tweets saying that U.S. President Barack Obama had been shot dead, prompting an investigation by the Secret Service.
"Hackers sent out several malicious and false tweets that President Obama had been assassinated," Foxnews.com said in a statement about the latest in a wave of high-profile cyber security breaches around the world.
"Those reports are incorrect, of course, and the president is spending the July 4 holiday with his family."
The media outlet, owned by Rupert Murdoch's News Corp, said the incident was being checked.
"The hacking is being investigated, and FoxNews.com regrets any distress the false tweets may have created," it said.
Obama is celebrating the July 4 Independence holiday with his family at the White House and was due to host military families to watch Fourth of July fireworks in the evening.
The White House declined to comment. The Secret Service, which is charged with protecting the president, said it was looking into the incident.
"The Secret Service is investigating the matter and will conduct the appropriate follow-up," spokesman George Ogilvie said.
The first hacked tweet appeared around 2 a.m. and said: "@BarackObama has just passed. The President is dead. A sad 4th of July, indeed. President Barack Obama is dead."
The next one, "@BarackObama has just passed. Nearly 45 minutes ago, he was shot twice in the lower pelvic area and in the neck; shooter unknown. Bled out."
The false tweets were removed around noon today, a Fox News spokeswoman said, after Twitter suspended the account.
Fox News Digital Vice President and General Manager Jeff Misenti said FoxNews.com was working with Twitter to address the situation as quickly as possible.
"We will be requesting a detailed investigation from Twitter about how this occurred, and measures to prevent future unauthorized access into FoxNews.com accounts," Misenti said.
In an email statement to Reuters, a spokesman for Twitter said, "while Twitter does monitor accounts for brute-force log-in attempts and similar methods of attack, we're unable to anticipate compromises that take place due to off-site behavior."
The Twitter spokesman also said that Fox News indicated its account had been compromised.
A group calling itself The ScriptKiddies claimed responsibility for sending the tweets -- including "#ObamaDead, it's a sad 4th of July" -- from the "FoxNewspolitics" news feed before Twitter suspended its access.
In all some six false tweets were issued, saying Obama had been shot at a restaurant in Iowa while campaigning.
Obama was not in Iowa this weekend. He returned on Sunday to the White House from a brief trip to Camp David in neighboring Maryland.
The Foxnews.com account hacking followed a wave of highly publicized cyber security breaches, including attacks on the bank Citigroup, Sony Corp., Apple and the U.S. Senate and Brazilian presidential websites.
The FoxNews.com hacking came two days before Obama's first "Twitter town hall" where he will field tweeted questions about the economy and jobs.
Twitter's co-founder and executive chairman, Jack Dorsey, is due to moderate that Wednesday session at the White House.
Fox.com, another Fox Entertainment Group website, was the target of an attack by hacker group Lulz Security in May.
LulzSec has also made assaults on Sony, the U.S. Central Intelligence Agency (CIA) and other targets. The attacks have mostly resulted in temporary disruptions to websites and the release of user credentials.