A smouldering backpack and a gas can were visible afterwards according to one witness.
Police quickly taped off the scene of the incident. Nearby, a pamphlet was visible that referred to “evil billionaires” and called on people to “expose this corruption”. The portion that was visible to the witness did not mention Trump.
It is unclear why the individual set himself on fire and what condition he is in. He is reported to have received medical attention before being rushed from the area in an ambulance.
Broadcasters recorded the scene – some then cut away and apologised for showing the footage – through metal barricades in place for Mr Trump’s trial.
The 12 jurors, along with six alternates, will consider evidence in a first-ever trial to determine whether a former US president is guilty of breaking the law.
The park is close to several courthouses and other buildings. Trump’s criminal trial, the first of a former president, is being conducted amid tight security in a 15th floor courtroom swarming with Secret Service officers as well as court police.
New York’s police department had promised a major deployment to ensure the trial passes off safely, with John Hart, the force’s head of intelligence calling it a “major challenge”.
A New York police department spokesman said: “A male did light himself on fire outside of the Supreme Courthouse. We’re still gathering details from the field.”
Emily Foster is a globe-trotting journalist based in the UK. Her articles offer readers a global perspective on international events, exploring complex geopolitical issues and providing a nuanced view of the world’s most pressing challenges.