A man who set himself on fire in the National Mall in Washington has died of his injuries, police said.
District of Columbia Police officer Araz Alali said the man died in a Washington hospital where he had been airlifted.
He said the man was so badly burned that he will need to be identified through DNA and dental records.
The man poured a can of petrol on himself in the centre section of the mall yesterday afternoon. He then set himself alight, with passing joggers taking off their shirts to help douse the flames.
Police are investigating the man's possible motives.
The incident came the day after a woman was shot dead by police outside the Capitol building in Washington when she tried to drive through barricades outside the White House.
Miriam Carey, 34, of Stamford, Connecticut, held the delusional belief that President Barack Obama was communicating with her, a federal law enforcement official said.
A car chase unfolded after she rammed the barricades, briefly shuttering the chambers where federal politicians were debating how to end a government shutdown, and stirring fresh panic in a city where a gunman killed 12 people two weeks ago.
A one-year-old girl was in the car, though she avoided serious injury and was taken into protective custody.