Barack Obama has been filmed placing what is believed to be a letter to incoming US President Donald Trump in a drawer in the White House.
The outgoing president then took his final walk through the White House gardens, as he prepares to handover to Mr Trump.
He waved at photographers and said "thank you" when asked if he had any final words for the American people.
Outgoing US Vice President Joe Biden and his wife were also pictured taking a final stroll through the White House gardens, ahead of Mr Trump's inauguration.
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Oman has announced it has given "temporary residency" to 10 prisoners released from Guantanamo Bay as Barack Obama continues his push to shrink the prison's population before leaving the White House.
President Obama pledged to shut the base down at the controversial Cuba-based US military prison when he campaigned for the presidency in 2008.
He last secured the release of prisoners in August 2016 before Oman's foreign ministry confirmed the latest transfer in a statement.
To meet a request by the US government to assist in settling the issue of the detainees at Guantanamo, out of consideration of their humanitarian situation, 10 people released from that prison arrived in the Sultanate of Oman for a temporary residency.
The outgoing president's declared commitment to transfers from 'Gitmo' earlier this month remains in direct opposition to his successor, who tweeted:
There should be no further releases from Gitmo. These are extremely dangerous people and should not be allowed back onto the battlefield.
President Obama has ended a longstanding policy which allows any Cuban who arrives in the US without a visa the right to become a resident.Read the full story ›
Michelle Obama has said packing up to leave the White House has been "surprisingly emotional" in her final TV interview as First Lady.Read the full story ›
Barack Obama thanked Americans for making him "a better man" in his final speech as US President before the handover to Donald Trump.Read the full story ›
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Alleged Russian hacking of the US should be considered "an act of war", Republican Senator John McCain has said.
Mr McCain said a lot more needs to be done in response to the hacks, saying America needs to make sure there is a price to pay.
The former presidential candidate made the remarks after President Barack Obama's administration unleashed a string of sanctions and ordered that 35 Russians be expelled from the US amid allegations of Russian meddling in the American presidential election.
"When you attack a country, it's an act of war," Mr McCain said on a visit to Kiev.
"And so we have to make sure that there is a price to pay, so that we can perhaps persuade the Russians to stop these kind of attacks on our very fundamentals of democracy."
Mr McCain said it was possible to impose many sanctions on Russia, including financial institutions, individuals and organisations.
He has scheduled a hearing for Thursday on foreign cyber threats.