The president, the first octogenarian in the US Presidency, moved Thursday from Washington DC to Falcon Stadium in Colorado for the graduation ceremony. After giving a speech and handing the last diploma to the cadets, he apparently tripped over a sack and fell to his knees and collapsed to the side.
The president, who was wearing a cap, then tried to sit up on his own, but had to be helped by an officer and two members of the U.S. Secret Service. It is unknown if the fall has caused any injury to the US president.