05 March, 2018
The agency says in a Twitter post that there are no other reported injuries related to the incident.
The man then fatally shot himself in the head, the Secret Service said.
Outside the White House several blocks are closed down by the Secret Service after reports a person allegedly suffered a self-inflicted gunshot wound.
National news outlets in America report that the man was in a large crowd when he fired the gun.
White House security was also considerably tightened around the perimeter. The Secret Service and Washington, D.C., Metropolitan Police Department are withholding the victim's name until his family is notified, a Secret Service release stated.
Penn State Basketball: Nittany Lions suffer heartbreaking defeat at No. 6 Purdue
The game was scoreless through the first three innings until Sloniger lifted a 1-1 pitch over the right field wall in the fourth. He did play through an injury to the same ankle during Purdue's silver medal run as Team USA in the World University Games.
The shooting sparked panic inside the building, with staff and journalists told to take shelter. He is spending the weekend at his Mar-a-Lago resort in Florida.
He said he had the information confirmed to him by a US Secret Service Agent at around midday local time.
No one else was injured, although there were reports that people at the White House sheltered in place.
Secret Service agents raced to the site following the shooting at around 5pm United Kingdom time on Saturday.
Authorities have since announced that a man shot himself to death outside the White House.