Group claims responsibility for false tweet:report

HONG KONG (MarketWatch) -- A group calling itself the Syrian Electronic Army, which is supportive of Syrian leader Bashar Al-Assad, has claimed responsibility for a false tweet from a hacked Associated Press twitter account that briefly slammed U.S. stocks Tuesday, according to reports. The attack shows how hackers were using so-called " phishing" techniques to misuse Twitter accounts belonging to some of the most respected news agencies in the world, The Huffington Post reported. It said the group has also taken credit for hacking the Twitter accounts of other news agencies including NPR, Reuters, BBC and Al Jazeera in recent weeks. CNBC reported separately that the Federal Bureau of Investigation, the Secret Service and the Securities and Exchange Commission were all investigating the tweet from the Associated Press account, which said that two explosions had occurred in the White House and that President Barack Obama was injured. AP later said its account had been hacked.