Joe Biden has been inaugurated as the 46th President of the United States, succeeding Donald Trump as the most powerful man in the world.

Kamala Harris, the former California Senator, has made history by becoming the first female US vice-President. 

While three former Presidents attended the ceremony, as well as vice-President Mike Pence, Trump did not. He had already left Washington DC for Florida, telling supporters on his way out that "we will be back in some form". Trump was impeached last week for his role in inciting violence at the Capitol on January 6 and is awaiting his trial in the Senate.

Security has been amped up around Capitol Hill following that siege, with more than 25,000 National Guard members surrounding the historic monument and on the streets. The FBI has warned of armed groups planning protests across the nation, many angered by Trump's loss.

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What you need to know:

• Joe Biden has been inaugurated at the Capitol building making him the new President of the United States. Kamala Harris has also been sworn in as Vice-President.
• Lady Gaga sang the national anthem at the inauguration event and Jennifer Lopez has also performed during the ceremony.
• Donald Trump left the White House as President for the last time on Thursday. Flanked by his wife Melania, Trump spoke to reporters on the South Lawn before boarding Air Force One to head to Mar-a-Lago resort in Florida. He said "we will be back in some form".
• Biden swore in his presidential appointees in a virtual ceremony from the White House, vowing to "fire [them] on the spot" if they fail to treat their colleagues with respect.
• Biden and members of both the Republican and Democratic parties attended a church service at the Cathedral of St Matthew the Apostle.
• There have been reports that a bomb threat has been called into the Supreme Court. The grounds are being checked over, but no one is being evacuated.
• In his final day in office, Trump granted a wave of pardons and commutations but decided not to pardon himself. Among those granted clemency were former White House aide Steve Bannon, former top Trump fundraiser Elliott Broidy, and rapper Lil Wayne.