On Wednesday, a man shocked onlookers in a park area, the Ellipse, that lies south of the White House as he walked across an area of the land while on fire. He was taken to the hospital but later succumbed to his injuries.

Arnav Gupta, 33, of Bethesda, Maryland, calmly walked in front of park visitors at around 12:20 p.m. Wednesday. Footage of the incident was taken and posted online, such as the following one.

Warning, the following content below is graphic.

In a tweet on Wednesday, the Secret Service confirmed the apparent self-immolation.

A spokesman for the Washington, D.C., fire department said first responders managed to extinguish the fire, and Gupta was arrested by police. TMZ reports he was then taken to the hospital with life-threatening injuries after suffering burns to 85 percent of his body. Gupta died in hospital on Wednesday night.

Sgt. Eduardo Delgado, a spokesman for the Park Police, said investigators do not know the man's motive at the time.

However, cops in Maryland did say in a media release early Wednesday, prior to the incident, that they were "concerned for Gupta's physical and emotional welfare." They also asked for public assistance in learning his whereabouts.

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In this image, the U.S. flag is seen over the White House in Washington, D.C., on Sept. 11, 2015. CHRIS KLEPONIS/AFP/Getty Images