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
Image source, Getty ImagesJeh Johnson, who could have become president, rides the Trump Tower elevator in December
In the event of a disaster, one member of the president's cabinet always stays behind.
That person, who is known as the designated survivor, was Secretary of Homeland Security Jeh Johnson.
In the event of the worst, he would have wound up as the new US president.
Trump's inauguration ceremony was broadcast live to millions of people around the world.
Image source, EPAA Russian family in St Petersburg watches Trump's speech live on Russian TV
Image source, EPAIn Tirana, Albanian supporters celebrate Trump's big day
Rather than using his new @POTUS Twitter account, the new president has used his @realDonaldTrump account to tweet segments from his inaugural speech.
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More snap analysis from BBC reporters...
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The Wall Street Journal's energy reporter spots this:
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In fact, all of the White House policy pages have been deleted or replaced by this image:
Solidarity protests are going on across Canada.
Here are some images from the scene in Montreal.
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This from the Washington Post:
Trump’s speech was about 1,400 words versus about 2,400 for President Obama’s first inaugural speech.
Obama’s second inaugural address in 2013 was about 2,100 words.
Obama and the former First Lady have just boarded a military helicopter which will take them to Andrews Air Force Base.
The chopper is called Executive One - not Marine One - since Obama is no longer president.
The Obamas will then will board a plane to California for a holiday.
The LA Times says the Obamas are headed to Sunnylands estate in Rancho Mirage, where the former president has taken several golf vacations and hosted foreign leaders over the past eight years.
As the former president departed, he shook hands with Trump and his wife, and also thanked his security detail
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Trump's reference to radical Islamic terrorism went down especially well with the crowd. The new president had consistently accused Obama of avoiding the term out of political correctness.
Obama had retorted that he was reluctant to lump in militants with the more than a billion Muslims around the world.
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These are the words Trump used most often during his speech.
Each word is given a size to indicate how frequently it was used.
It appears that "America" and "Americans" were some of the President's most often-used words.
More insta-analysis from our correspondents at the scene...
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The new president flanked by the new first lady, Melania, and their son Barron.
Image source, ReutersThe New Yorker takes an inauguration potshot at Trump's bombastic speaking style.
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President Trump now has control of the official @POTUS Twitter account, including all of the followers it comes with.
How long until he uses his new megaphone?
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BBC Radio 5 live
Dr Mike Cornfield, associate professor of Political Management at the George Washington University, told BBC Radio 5 live's Anna Foster he thought President Trump's address was the "angriest inaugural address" he had ever heard.
Dr Cornfield said he thought the new president's approach was "confrontational", "vintage populism" and "extraordinary for a man who did not win the popular vote and did not fill this Mall".
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Trump on radical Islamic terrorism, and hopes and dreams...
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The National Anthem was sung by 16-year-old former America's Got Talent contestant Jackie Evancho, accompanied by the US Marine Band.
Her performance sounded like it was live. In 2013, Obama's last inaugural, Beyonce was criticised for lip-synching the national anthem in her performance.
BBC reporters in the area say crowds are now repositioning themselves to try to get a view of Trump as he leads a parade back to the White House.
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The @FLOTUS, external account has also been turned over, passing from Michelle Obama to Melania Trump.
Michelle Obama is now tweeting from @FLOTUS44, external.
Trump had three clergy deliver invocations, and now he’s got three more for benedictions and scripture readings. Six is an inauguration record. Most have two, Nixon had five.
The rabbi, Marvin Hier, founded the Simon Wiesenthal Center in Los Angeles to fight anti-Semitism and bigotry. More than 3,000 people signed a petition asking him not to participate in this inauguration because they said Trump has only encouraged bigots.
Rabbi Hier stood by his decision. He is friendly with the family of Jared Kushner, Trump’s son-in-law and an Orthodox Jew. His family are big donors to the Wiesenthal Center.
As prayers continue, Reverend Franklin Graham tells the new president that the rain falling is a sign from above.