A person set himself on fire outside the US Supreme Court on Friday, a spokeswoman said -- the second incident to raise alarm near the Capitol in Washington in a week.  

"At approximately 6:30 pm (2230 GMT), an individual went onto the plaza in front of the Supreme Court building and set themselves on fire," Supreme Court spokeswoman Patricia McCabe said in a statement.

"This is not a public safety issue," she said, adding that no one else was injured.  

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No details about the person's health, identity or motives were provided.  

"A medical helicopter just landed near the Capitol for a medical emergency," US Capitol Police tweeted shortly after the incident.

The helicopter landed on the plaza and airlifted the person to a local hospital, McCabe said.  

The area was inaccessible and under investigation on Friday. 

The incident comes days after the Capitol was evacuated when authorities sounded a threat alarm over a harmless parachute stunt.

The alarm was triggered by a US Army parachute demonstration team's flyover at a nearby baseball stadium as part of a pre-game show.