Updated Oct. 5, 11:50 a.m.: The man has since died from his injuries, the AP is reporting.
Witnesses said a man doused himself with gasoline and lit himself on fire Friday afternoon at the National Mall in Washington, D.C.
Flames could be seen from across the Mall.
Local law enforcement said that the man was conscious and breathing when authorities arrived.
Witnesses said two men ran up to the man and put the fire out using their shirts.
The unidentified man was airlifted out by medical helicopter.
It's unclear if the incident was politically motivated.
Police investigated the gas canister used in the fire.
D.C. Fire Department spokesman Timothy J. Wilson told The Washington Post that the man has life-threatening injuries.
D.C. police closed down the streets near the incident.
Ryan Broderick is a reporter for BuzzFeed News and is based in London.
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