The F-B-I is investigating a fake tweet, which claimed President Obama had been injured in explosions at the White House.

The tweet which was sent from the Associated Press news agency said there had been two explosions at the residence of the President of the United States.

AP claims hackers took over their Twitter account and posted a number of false tweets.

The account has now been suspended but the bogus tweet has had a knock on affect on the US stock market which saw share prices plunge on the back of the tweet.

A group calling itself the Syrian Electronic Army are reported to have claimed responsibility on its own Twitter feed for the AP hack.

FBI spokeswoman Jenny Shearer said the bureau was investigating how hackers were able to send out the bogus tweets.