President Joe Biden takes a tumble on the stage during Air Force Academy graduation

After President Joe Biden greeted more than 900 graduates on the stage of Falcon Stadium on Thursday he took a tumble while heading back to his seat. You can see it in the video clip below:

The fall happened during the U.S. Air Force Academy graduation ceremony in Colorado Springs, where Biden delivered the commencement address.

Biden was helped back up and pointed out that he had tripped over something.

Afterwards he sat back down and appeared to be fine.

White House communications director Ben LaBolt wrote on Twitter that there was a sandbag on the stage.

Biden is 80 years old and walks stiffly due to degenerative osteoarthritic changes. That's what his doctor told him in a routine physical earlier this year.