Joe Biden falls on stage at US air force academy ceremony

The US president, Joe Biden, tripped and fell after handing out the last diploma at a graduation ceremony at the US air force academy in Colorado.
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Footage showed Biden, 80, falling to the ground before being quickly helped up by an air force officer and two Secret Service agents. He walked back to his seat unassisted. The White House communications director, Ben LaBolt, tweeted: 'He's fine. There was a sandbag on stage while he was shaking hands'