US President Joe Biden has begun to undo some of Donald Trump’s key policies, hours after being sworn in.
In his initial acts as the 46th US president, he signed 15 executive orders – the first to boost the federal response to the coronavirus crisis.
Other orders reversed the Trump administration’s stance on climate change and immigration.
President Biden set to work at the Oval Office having been sworn in earlier on Wednesday at the US Capitol.
The inauguration was unlike any other due to coronavirus restrictions, with few present to witness the oaths and ceremonies.
Donald Trump – who has still not formally conceded the presidency to Mr Biden – snubbed the event in a departure from longstanding precedent.
“Democracy has prevailed,” President Biden said after taking the oath of office with Chief Justice John Roberts.
Delivering a message of unity after the turbulent Trump years, he promised to be a president “for all Americans” – including those who voted against him.
Three of his predecessors attended the ceremony: Barack Obama – under whom Mr Biden served for eight years as vice-president – Bill Clinton and George W Bush, as well as Mr Trump’s vice-president, Mike Pence.
Kamala Harris was sworn in as vice-president ahead of Mr Biden. She is the first woman – and the first black and Asian-American person – to serve in the role.
There was extra-tight security for the ceremony at the US Capitol after the building was stormed by violent pro-Trump protesters on 6 January.
Mr Biden and First Lady Jill Biden, together with Ms Harris and her husband Doug Emhoff, then walked down Pennsylvania Avenue to the White House, greeting friends and supporters.