Barack Obama has officially been sworn in for his second term as US president in a small ceremony at the White House.
Mr Obama took the oath in the Blue Room to meet the 20 January date set out in the US Constitution.
Given this fell on a Sunday, a public inauguration with pomp and circumstance will take place on Monday.
Vice-President Joe Biden was sworn in for a second term at a small ceremony at his official residence earlier on Sunday morning.
Supreme Court Chief Justice John Roberts administered the oath of office to Mr Obama, witnessed by First Lady Michelle Obama and their daughters Sasha and Malia as well as some family members and reporters.
Resting his hand on a Bible used for many years by his wife's family, Mr Obama vowed "to preserve, protect and defend the Constitution of the United States".
He will repeat those words during Monday's public inauguration, in which he will also set out his plans for the next four years.
Mr Biden will also repeat his oath publicly on Monday
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