• Donald Trump sworn in as 45th President of the United States of America
• Republican puts American interests at heart of first speech as new US leader
• Donald Trump promises to bring "power to the people" and pledges to protect his country's borders
• New US President uses first speech to say he will unite world against radical Islam
• Barack Obama leaves the Oval Office for final time as President after two terms in power
• Riots break out in Washington DC as activists smash the windows of Bank of America branch
• Trump administration announces plans to build missile defence system to protect against attacks from North Korea and Iran
Donald Trump vowed to put "America first" and said "America will start winning again like never before" moments after being sworn in, as riot police gear up for protests as hundreds of thousands of people descended on Washington DC for the ceremony.
In one of his first moves as president, the White House website announced the Trump administration will develop a state-of-the-art missile defence system to protect against missile-based attacks from states like Iran and North Korea.
Making his first speech as president, he said: “Today’s ceremony has very special meaning.
“We are not just transferring power from one party to another.
“We are transferring power from Washington DC and giving it back to you, the people.”
Donald Trump prepares to become the 45th US president
The 45th president of the US built on his 'we will make America great again slogan' in his first speech as commander-in-chief.
He said: “We the citizens of America are now joined to rebuild this country and restore its promise for all of our people. “Together we will determine the course of America and the world for many years to come.
“We will face challenges, we will confront hardships but we will get the job done.”
The billionaire businessman said every decision on trade, tax and foreign affairs "will be made to benefit American workers and American families" to huge applause.
He added: "We will shine for everyone to follow" as he pledged to build relations with the world, eradicate Islamic terrorism and protect US borders.
Barack and Michelle Obama leave Washington DC by helicopter
Farewell Obama – President and First Lady wave goodbye to former president
"We will make America great again", President Trump addresses the US public
No challenge can match the fight, and heart and spirit of America. We wil not fail, our country will thrive and prosper again
Mr Trump said: "No challenge can match the fight, and heart and spirit of America. We wil not fail, our country will thrive and prosper again."
The president made promises to "heal divisions" and vowed "we will make America great again".
"What truly matters is not which party controls our government but whether our government is controlled by the people.
"January 20 2017 will be remembered as the day the people became the rulers of this nation again.
"The forgotten men and women of our country will be forgotten no longer."
Donald Trump becomes 45th U.S. PRESIDENT
Fri, January 20, 2017
The inauguration of Donald Trump as the 45th President of the United States will mark the commencement of the four-year term of Donald Trump as President and Mike Pence as Vice President. A public ceremony will be held on Friday, January 20, 2017, on the West Front of the United States Capitol Building in Washington, D.C.
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U.S. President Donald Trump gives a thumbs up after being sworn in as the 45th president of the United States on the West front of the U.S. Capitol in Washington
To huge cheers, Mr Trump said: "America will start winning again, winning like never before.
"We will bring back our jobs, we will bring back our borders, we will bring back our wealth and we will bring back our dreams.
"We will build new roads and highways and bridges and airports and tunnels and railways all across our wonderful nation.
"We will get our people off welfare and back to work rebuilding our country with American hands and American labour.
"We will follow two simple rules, buy American and hire American."
Mr Trump is sworn in as the 45th president of the US
The president's wife Melania and four of his children congratulate him
The president used his own bible and the bible used by Abraham Lincoln for his 1861 inauguration
Barron Trump yawns during his father's first speech as president
He went on: "Everyone is listening to you now.
"You came by the tens of millions to become part of a historic movement the likes of which the world has never seen before.
"At the centre of this movement is a crucial conviction – that a nation exists to serve its citizens."
The president said Americans want "great schools for their children, safe neighbourhoods for their families and good jobs for themselves."
Mr Trump then signed formal paperwork, including a proclamation for a national day of patriotism, making his presidency official surrounded by his children and grandchildren.
Vice-president-elect Mike Pence was earlier sworn in by Clarence Thomas, the associate justice of the Supreme Court.
The Obamas left the capital by helicopter to spend time in California.
Donald Trump arrives to be sworn in as president
Protests broke out earlier today as the Trumps met the Obamas at the White House with anti-Trump activists dressed in black smashing the window of a Bank of America branch in the capital.
Police used handheld water cannons as they moved in to disperse the trouble as violence broke out on the streets.
Washington Police made "numerous" arrests on Friday after violent protests during Mr Trump's inauguration, with a number of people charged with rioting, the city's police department said.
In a statement Washington Police said: "Pepper spray and other control devices were used to control the criminal actors and protect persons and property.”
Two police officers were injured and police cars damaged in the riots, which police called “co-ordinated attacks”.
Organisers expect crowds of upwards of 900,000 people, including protestors.
Mr Trump invited six religious leaders to give readings and pray at the inauguration– more than any other US president. The ceremony began with Roy Blunt, chairman of the congressional inauguration committee, introducing the event ahead of a series of prayers.
Wearing tartan in a nod to Mr Trump’s Scottish heritage, Missouri State University Chorale performed.
Mr Obama and Mr Trump shake hands ahead of the inauguration
Donald Trump's son Barron takes his seat with his mother Melania
Donald Trump's children arrive at the ceremony
Donald Trump arrives at Capitol Hill with Barack Obama
Mr Obama, accompanied by his friend and vice-president Mr Biden, was greeted by applause and cheers as he walked down the steps to the platform.
He had a broad smile on his face as he greeted dignitaries, before warmly shaking hands with members of Mr Trump's family.
Mr Trump and wife Melania attended the traditional church service this morning before outgoing president Barack Obama and his wife Michelle welcomed the couple to the White House for tea and to show them around their new home before the ceremony.
Mr Trump said on Twitter: "It all begins today! I will see you at 11:00 A.M. for the swearing-in. THE MOVEMENT CONTINUES – THE WORK BEGINS!"
He and vice president elect , Mike Pence, will take the oath of office at 5pm GMT outside the domed US Capitol, with US Chief Justice John Roberts presiding.
Mr Trump, whose November 8 victory stunned the world, started his presidency with a 20-minute inaugural address that he has been writing himself with the help of top aides.
His spokesman Sean Spicer told NBC: "It will be optimistic. It will be visionary, but it's going to be philosophical.”
Riot police fire water cannons at protestors in Washington
Anti-Trump protests kick off in Washington
The new president addressed hundreds of thousands of people gathered in the capital, including his adversary Hillary Clinton and her husband Bill, as well as Mr Obama and former president George W Bush.
Mrs Clinton looked steely-eyed as she awaited Mr Trump's arrival, but Tweeted: "I'm here today to honor our democracy & its enduring values. I will never stop believing in our country & its future."
Hillary and Bill Clinton arrive for the ceremony
Former president George Bush arrives with wife Laura
Former Ukip leader Nigel Farage, who was the first British politician to meet Mr Trump after his election victory, has travelled to Washington for the ceremony.
The 70-year-old Mr Trump stayed the night at an official guest house near the White House and then attended a morning prayer service at St. John's Episcopal Church, a block away.
Mr Trump, wearing a dark suit and red tie, was accompanied by his wife, Melania, clad in a classic-styled, powder blue ensemble, and his family.
The Obamas welcomed the Trumps to the White House
Barack Obama welcomes Melania Trump to the White House
Barack Obama departs the Oval Office for the last time as president
Streets near the president's home were blocked to traffic by empty buses and dump trucks or temporary pedestrian security checkpoints where law enforcement officers and National Guard troops checked people's bags.
Checkpoints around the National Mall in front of the Capitol opened early to begin admitting guests, some of them wearing red caps bearing Mr Trump's "Make America Great Again" slogan.
They were barred from bringing selfie sticks, coolers for beverages, and long umbrellas despite the rainy weather.
Melania and Trump leave the church
Today Trump will become the 45th president of the US
Most of the area was orderly, but about 100 protesters shouted slogans near one checkpoint and linked arms to block people from entering.
Police in riot gear pushed them back into an intersection to allow people attending the inauguration to reach the checkpoints.
Thousands of anti-Trump protesters are expected among the inauguration crowd and many demonstrators will participate in a "Women's March on Washington" on Saturday.
Market analyst says markets are jittery over Trump uncertainty
Obama and Trump leave the Whitehouse together
President Obama and Trump travel up Capitol Hill
Trump is at a church close to the White House in Washington
People gather to watch the inauguration in Washington DC
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Looking back at over 50 years of inaugural fashion.
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US President-elect Donald Trump and his wife Melania leave St. John's Episcopal Church on January 20, 2017, before Trump's inauguration.
Protests are also planned in other cities in the US and Britain.
Dignitaries and VIPs have begun arriving at the US Capitol building ahead of Mr Trump's swearing-in ceremony.
Among them are former president Bill Clinton and his wife Hillary, whom Mr Trump defeated in a bitter contest that left America divided.
Former vice president Dick Cheney was also seen arriving at the Capitol, pausing to chat with Mr Trump's new chief strategist, former Breitbart News boss Steve Bannon.
More to follow…