Hail to the Chiefpublished at 17:01 Greenwich Mean Time 20 January 2017
"Congratulations, Mr President," says Chief Justice Roberts. The crowd roars and the Marine Band plays Hail to the Chief.
And just like that, Barack Obama is a civilian again.
Summary
Donald Trump sworn in as 45th US president, in historic power transfer from President Obama
In his inaugural address he vowed to fight for the "forgotten" Americans
Taking aim at Washington elites, he vowed: "Our country will prosper again"
Protesters have smashed windows and clashed with riot police on Washington's streets
Hail to the Chiefpublished at 17:01 Greenwich Mean Time 20 January 2017
Solemn Trump sworn inpublished at 17:00 Greenwich Mean Time 20 January 2017
With hand raised, trump says: "I do solemnly swear that I will faithfully execute the Office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States."
Donald Trump is sworn inpublished at 16:59 Greenwich Mean Time 20 January 2017
BreakingChief Justice of the United States, John Roberts, is administering the presidential oath of office to Donald Trump.
Obama v Trump crowd numberspublished at 16:59 Greenwich Mean Time 20 January 2017
Some interesting stats from Obama v Trump inauguration crowd numbers, picked up by Metro and seen by BBC's North America reporter Anthony Zurcher.
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End of twitter post 2Is this a thing?published at 16:58 Greenwich Mean Time 20 January 2017
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End of twitter postTrump oath coming uppublished at 16:58 Greenwich Mean Time 20 January 2017
The Mormon Tabernacle Choir, resplendent in tartan and white, is singing America the Beautiful.
Trump's oath of office is moments away.
This choir probably would have enjoyed singing for Mitt Romney, who would have become the first Mormon president if he had defeated Barack Obama in 2012.
Live Periscopepublished at 16:55 Greenwich Mean Time 20 January 2017
The BBC's Rajini Vaidyanathan is among the crowds of Trump supporters on the National Mall.
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End of twitter postMike Pence taking oath of officepublished at 16:54 Greenwich Mean Time 20 January 2017
Clarence Thomas, Supreme Court justice, is administering the oath of office to vice-president elect Mike Pence. And it's over in seconds. "Congratulations," Justice Thomas says, and the crowd roars.
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End of twitter post'Best days to come'published at 16:53 Greenwich Mean Time 20 January 2017
"I know our best days are yet to come," says Chuck Schumer, a familiar refrain from US politicians who like to assure Americans of sunlit uplands ahead.
'Immigrant or native-born'published at 16:52 Greenwich Mean Time 20 January 2017
Chuck Schumer says: "I stand here today confident in this great country for one reason. You, the American people."
He calls Americans a "forward-looking and problem-solving" people "whether we are immigrant or native-born".
He praised the peaceful balance of power.
Schumer, as the top Democrat on Capitol Hill, has led the opposition to Trump's cabinet nominees.
Mocking Trump's pledge to "drain the swamp", he has called Trump's nominees "a swamp cabinet".
Praising 'freedom of religion'published at 16:50 Greenwich Mean Time 20 January 2017
Democratic Senate Leader Chuck Schumer is speaking now, praising "freedom of speech and religion, the things that make America America".
Bird's eye viewpublished at 16:47 Greenwich Mean Time 20 January 2017
Have a look at what the current crowd looks like from above.
Media caption, Inauguration: 'These crowds are thin'
'Build bridges - not walls' - international reactionpublished at 16:46 Greenwich Mean Time 20 January 2017
In the UK and Australia there have been demonstrations against a president seen by protesters as a threat to the international order.
In London, a banner was unfurled on Tower Bridge that read simply "build bridges, not walls" - a reference to Trump's pledge to build a barrier on the Mexico border.
Image source, PAInvoking Solomon's wisdompublished at 16:44 Greenwich Mean Time 20 January 2017
Cardinal Timothy Dolan beseeches God to help the American people and their incoming president.
The head of the New York archdiocese read the prayer of King Solomon and gave the Sign of the Cross before reading.
Trump kept his hands clasped and head bowed.
The prayer rhetorically asked: "Who can know your counsel, unless you give Wisdom and send your holy spirit from on high?"
Helicopter for Obamapublished at 16:42 Greenwich Mean Time 20 January 2017
Even though he'll soon be an ex-commander-in-chief, Obama will still get the star treatment as he departs into the history books...
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End of twitter postTrump speech coming uppublished at 16:40 Greenwich Mean Time 20 January 2017
We don't know much about Trump's speech, but earlier today his official spokesman said it will last about 20 minutes.
Some of his top aides, including Stephen Miller, Kellyanne Conway, Reince Priebus and Steven Bannon, helped him write it, but the Trump team insists the majority was written by the future-president himself.
Image source, APRunning commentary from BBC expertpublished at 16:39 Greenwich Mean Time 20 January 2017
If you're watching the ceremony live, the BBC's North America reporter Anthony Zurcher is providing running commentary on Twitter.
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End of twitter postRoy Blunt welcomes crowdspublished at 16:39 Greenwich Mean Time 20 January 2017
Missouri senator Roy Blunt, chairman of the congressional inauguration committee, is introducing the swearing in ceremony.
Russia Today reporter 'arrested'published at 16:38 Greenwich Mean Time 20 January 2017
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End of twitter postDetermined Trump supporterspublished at 16:35 Greenwich Mean Time 20 January 2017
More from a team of BBC correspondents on the ground.
These people have been waiting a long time for the inauguration ceremony, tweets Charlie Northcott.
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End of twitter postTrump all the way - this is a beaming young supporter in a colourful T-shirt, as Rajini Vaidyanathan reports.
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