Joe Biden tripped and fell during a graduation ceremony at the US Air Force academy on Thursday.
The 80-year-old president was quickly helped up by three people.
He, however, walked back to his seat unassisted following the incident in Colorado.
As the leader was helped up, he pointed behind him, seeming to indicate what he tripped over.
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White House communications director Ben LaBolt said Mr Biden was fine.
“There was a sandbag on stage while he was shaking hands,” he said on Twitter.
Mr Biden, who stood for much of the hours-long ceremony to shake hands with graduates, appeared to trip over something and fell to his knees towards the end as he handed out the last diploma.
He was helped up by an Air Force officer as well as two members of his US Secret Service detail. Onlookers, including some members of the official delegation on stage, looked over in concern before the leader returned to his seat.
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At the presentation, he gave salutes to the blue-uniformed graduates.
Credit PM News