Donald Trump has opened his first full day in office by attending a multi-faith prayer service.
The President arrived with Melania and sat next to Vice President Mike Pence and his wife Karen at the Washington National Cathedral.
Prayers are being led by representatives of multiple faiths including various forms of Christianity, Islam, Hinduism and Judaism.
Later today, Mr Trump is expected to visit the CIA headquarters in Langley, Virginia - an agency he criticised after it concluded Russia was involved in hacking emails to interfere in the presidential election.
- Video report by ITV News Correspondent Richard Pallot
Less than 24 hours after taking office President Trump has begun dismantling one of the flagship policies of his predecessor.
He's signed an executive order limiting so-called Obamacare - the law which provides cheap medical care for workers.
But first, he danced the night away at three celebration balls in Washington.
Germany's Chancellor Angela Merkel says Donald Trump 'made his convictions clear' in his inauguration speech.
When asked about America's new president's swearing-in on January 20, she said that transatlantic relations 'will not be less important in coming years'.
Merkel added she will 'always seek compromise', in her reaction to Mr Trump's speech.
Sources claim that while the inauguration was happening in Washington DC, the German leader attended the opening of an art museum in Potsdam, Germany.
Russian President Vladimir Putin is ready to meet President Trump but preparations for the possible meeting may take months, Kremlin spokesman Dmitry Peskov was quoted as saying by TASS news agency.
"This will not be in coming weeks, let's hope for the best - that the meeting will happen in the coming months," Peskov told the BBC, according to TASS.
Foreign Secretary Boris Johnson says he's "positive and optimistic" the policies set out by President Donald Trump in his inauguration speeches will be good for the UK.
Speaking in Myanmar, Mr Johnson said he was "very optimistic" a trade deal could be done quickly with the new president, once Britain had left the European Union.
In his inaugural speech, Mr Trump said he would put "America first", but Mr Johnson said any deal with the US would have "to work for the UK as well."
He says: "I think that the new president has made it very clear that he wants to put Britain at the front of the line for a new trade deal and obviously that's extremely exciting and important."
President Donald Trump greeted the audience at the first of Friday's three inauguration balls with a resounding "we did it".
Before dancing to 'My Way' with First Lady Melania, the president told his supporters at the Liberty Ball that "today had been a great day".
He said: "People who weren't so nice to me, said we did a really good job."
"We began this journey and they said that we, we, and me, didn't have a chance. But we knew we were going to win," he continued.
Referring to the rain holding off during the inauguration, Mr Trump said: "It was like God was looking down on us."
He said: "And now the work begins. There are no games. We are not playing games.
"We're going to be producing results."
President Donald Trump signed his first executive order shortly after his inauguration parade that is aimed at beginning the process of repealing Obamacare.
Less than 24 hours after being sworn in as the 45th President of the United States, President Trump made good on one of his campaign promises to work on weakening the Affordable Healthcare Act by signing an executive order "directing agencies to ease the burden of Obamacare" pending repeal.
The President's spokesman Sean Spicer said the White House also issued an immediate regulatory freeze for all government agencies.
US Vice President, Mike Pence has sworn in defense secretary James Mattis and homeland security security John Kelly.
Mr Mattis and Mr Kelly are the first official members of President Donald Trump's cabinet.
Before his inauguration parade, Mr Trump had signed the commissions for his new defense secretary and his homeland security secretary who had been confirmed by the Senate earlier on Friday.
- Video report by ITV News Correspondent Martin Geissler
Violence erupted on the streets of Washington on Friday as anti-Trump protesters hurled rocks and bottles and set fires.
Multiple vehicles were set on fire, including a black limousine and a television truck.
Police responded to the trouble with tear gas and concussion grenades.
At least 200 people were arrested and two officers injured in scuffles with activists.