From Haaretz:

The Fox News Twitter feed has reportedly been hacked Monday, with a series of tweets announcing that President Barack Obama had been assassinated.

The first tweet to announce the news that Obama had been shot dead were sent by @foxnewspolitics at approximately 2am local time to its feed’s 33,000 followers, a blog on the website of the U.K.’s Guardian newspaper reported. The tweets were rapidly shared on the internet, the Guardian News blog said.

The first tweet announced “The president is dead,” and was followed by a second tweet describing the nature of the alleged shooting: “Barack Obama has just passed. The President is dead. A sad 4th of July,
indeed. President Barack Obama is dead… Nearly 45 minutes ago, he was shot twice in the lower pelvic area and in the neck; shooter unknown. Bled out.”