Syrian Electronic Army claimed responsibility, tweeting out: “Ops! @AP get owned by Syria #Syria #ByeByeObama” AP said later: “The @AP twitter account has been hacked. The tweet about an attack at the White House is false,” spokesman Jay Carney said. The wire service said its mobile Twitter account was also broken into, and all of its accounts have been shut down. Attack may have originated with a spear-phishing campaign, in which attackers send a cleverly disguised e-mail from a friend, or work contact, that contains a malicious link or attachment.
Source: https://thehackernews.com/2013/04/hacked-twitter-account-of-associated.html