Barack Obama has been sworn in as US president for the second time in two days, because one word was given out of order during Tuesday's inauguration ceremony, BBC reported.

The oath has been administered by Chief Justice of the US Supreme Court, John Roberts, at the White House.

Official reports claim that Obama took the decision to repeat the oath out of an abundance of caution.

In contrast to the first oath-taking, Mr Obama did not swear on a Bible, his wife Michelle was not at his side and instead of an audience of millions, only a few close aides saw the second attempt.

During the Tuesday's ceremony, in the oath, as set out in the US Constitution, the new incumbent swears to "faithfully execute the office of president of the United States".

But as Chief Justice Roberts read out the oath for Mr Obama to repeat, he moved the word "faithfully" to the end of the phrase.

At earlier times in history, two other US presidents, Calvin Coolidge and Chester Arthur, have had to repeat the oath because of similar problems.

And Chief Justice William Taft introduced a new word into the oath when he swore in President Herbert Hoover in 1929, promising to "preserve, maintain and defend the Constitution", instead of "preserve, protect and defend".

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