Donald Trump has been sworn in as the 45th president of the United States.
The new president took the oath of office on the steps of the Capitol building as his family and outgoing president Barack Obama watched on.
As the ceremony began, Mr Trump was met with cheers and applause as he took the platform.
A Bible between them, Mr Trump was sworn in by Chief Justice Roberts just before noon local time (5pm), before the two men shook hands.
Ahead of the ceremony Mr Trump tweeted: "It all begins today! I will see you at 11:00 A.M. for the swearing-in. THE MOVEMENT CONTINUES - THE WORK BEGINS!"
Vice President Mike Pence waved to the crowd after being sworn in just prior to Mr Trump, by associate justice of the Supreme Court Clarence Thomas.
Hundreds of thousands of people gathered in Washington and tuned in around the world as Mr Trump delivered his first presidential speech.
But there were protests on the streets of the capital with people smashing windows, attacking buildings and clashing with both police and Trump supporters.
Similar protests are taking place around the world as the swearing-in of the new president took place.
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