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
Here's Obama's first post-presidential address, in which he thanked his staff, before he and Michelle Obama were whisked away on holiday.
Barack Obama: 'Yes we did, yes we can'
Image source, PoolTrump spoke to Congressmen during a luncheon
Trump is heading to his new property, the White House, soon.
But he just told Congressmen at a lunch on Capitol Hill: "We all want the same thing. We're all good people. Whether you're Republican or Democrat, it doesn't make any difference. We're gonna get along."
Obama took office with the same healing message of bipartisanship, before Congress was engulfed by political trench warfare about 90 seconds later.
Wonder how long the kumbaya moment will last this time around.
NBC reports that flash-bang grenades were heard in Washington as anti-Trump protests intensified.
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Check out our nifty interactive slider for some side-by-side comparisons of Obama's inauguration in 2009 and Trump's.
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Canadian Prime Minister Justin Trudeau offered his congratulations on Friday to Donald Trump, the 45th president of the United States.
In a statement, the Liberal Prime Minister said the US and Canada benefited from "robust trade and investment ties, and integrated economies, that support millions of Canadian and American jobs".
He added: "We both want to build economies where the middle class, and those working hard to join it, have a fair shot at success,.
“Canada and the United States have unparalleled cooperation on matters of national security, and have always worked side by side to protect our citizens and ensure our shared border is secure."
The prime minister did not attend the inauguration himself.
But Canada was represented by Foreign Minister Chrystia Freeland and other government officials.
A Washington DC police official tells the BBC that “about 95” protesters have been arrested so far.
Two police officers have been injured and have “non-life threatening injuries”.
Both officers been transported somewhere for treatment, but the press officer did not know where.
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Image source, Getty ImagesPope Francis has previously made statements that seemed to question the president's faith.
Pope Francis said in a message to Donald Trump after he was inaugurated that he should show concern for the poor, and be guided by ethical values.
"Under your leadership, may America's stature continue to be measured above all by its concern for the poor, the outcast and those in need ...," the Pontiff wrote.
In February 2016 Trump called the Pope "disgraceful" after the head of the Catholic church said that building walls, "is not Christian".
The remark was seen as a veiled criticism of Trump's proposed border wall with Mexico.
In a press release from February with the title "Donald J Trump's Response to the Pope, external", Mr Trump laid into Pope Francis, who he called "a very political person" but he later hadded that the Pontiff "seemed like a pretty good guy".
Former UK Independence Party leader Nigel Farage was at the Trump inauguration in DC.
He told the BBC the new president's speech was "great stuff!"
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Image source, Getty ImagesDonald Trump was joined by members of his family on the eve of his inauguration. So who are they?
Donald Trump was joined by members of his family on the eve of his inauguration. So who are they?
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Image source, Getty ImagesMelania held an umbrella when it started to rain briefly
The new first lady, Melania Trump, "completely overshadowed" her predecessor in her choice of outfit for the inauguration, writes Slovene daily Svet24, external.
Opting to wear a combination designed by Ralph Lauren, Trump perhaps also aimed to take a little poke at Hillary Clinton, a fan of the same designer, according to the paper.
Slovene fashion critics - who had long been waiting to see what Melania would choose to wear - immediately agreed that with "such elegance" she "definitely overshadowed everyone around her" and that she could be compared to "one and only Jackie Kennedy".
BBC Monitoring, external contributed to this report.
Protesters on the march in DC
Filmed by Cat Lewis
A family of President Trump supporters react to his "monumental" inauguration speech.
US President Donald Trump speech in full
"We will determine the course of America and the world for many, many years to come", Donald Trump said at his inauguration.
"We will determine the course of America and the world for many, many years to come", Donald Trump said at his inauguration.
Read MorePolice fired tear gas at a rally in Nigeria organised in support of new US President Donald Trump.
A separatist group said 11 people were killed in Friday's clash, but police denied anyone died.
The demonstration was organised in southern Rivers state by activists who want Trump to support the creation of an independent Biafran state for the Igbo people.
Image source, Nwokoleme SamuelPolice say tear gas was fired at the rally to disperse the protesters
Police fire tear gas at pro-Biafra rally in Nigeria organised in support of new US President Donald Trump.
Read MoreThe gap the former president will leave
Trump has just issued his inaugural tweet from the official president's Twitter handle.
This is the first time the account has been included in the formal transfer of power, since no president before Obama had a presence on the social media platform.
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Nearly 100 people have been arrested amid a standoff between protesters and police in Washington DC.
"We have arrested approximately 95 people," said Metropolitan Police Department spokesman Lt Sean Conboy, adding they were arrested for "vandalism and destruction of property".
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Before leaving office, Obama ordered two major counter-terrorism air strikes.
Just before the inauguration ceremony began, the Associated Press reported that a B-52 bomber hit an al-Qaeda training camp in Syria on Thursday, killing more than 100 people.
A defence official describes those killed as "core" members, who had moved to Syria early last year to establish a foothold, rather than members of the Nusra Front, which is a local al-Qaeda affiliate.
Less than 24 hours earlier a combination of B-2 stealth bombers and drones struck two military camps in a remote part of Libya, killing up to 90 militants, according to Pentagon spokesman Peter Cook.
Image source, Getty ImagesA B-2 bomber like this was used in the strikes in Libya
Trump supporter Chris Fujita gives his verdict
Trump supporters give their view on the inauguration
Image source, Getty ImagesThe Clintons greeted dignitaries on the dais ahead of the ceremony
Some have complained that Trump owed rival Hillary Clinton a mention in his inaugural speech, given that she attended his big day.
But according to the Washington Post, when she and former President Bill Clinton arrived at the swearing-in luncheon, Trump walked to the Clintons’ table and shook her hand.
"Thank you for being here," Trump reportedly whispered.