He was immediately met with Uniformed Division Officers who put out the flames and administered first aid, the Secret Service said in a separate tweet.
The man has reportedly been taken to the hospital with non-life threatening injuries.
The blaze was extinguished before local firefighters could respond, said Doug Buchanan, a spokesman for the DC Fire and Emergency Medical Services. Pedestrian traffic on Pennsylvania Avenue was closed following the incident.
Helicopters are circling overhead but per USSS there is "no threat to the president" and first aid is being rendered to the man.
An individual in Lafayette Park, across Pennsylvania Avenue from the White House, lit his jacket on fire while he was wearing it, a law enforcement official told ABC News. Portions of the White House complex were also locked down.
The White House has been the scene of a number of security alerts over the past few years.
Reporters tweeted from the scene as it was happening.
The US Secret Service says the incident happened at about 3:15pm local time.
A man was arrested after trying to set his clothes on fire near the White House on Friday.
"He is being treated for injuries".
Fire officials are now said to be investigating the suspicious package.
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