WASHINGTON (AP) — A man set himself on fire on the National Mall in the nation’s capital as passers-by rushed over to help put out the flames, officials and witnesses said Friday afternoon.

The reason for the self-immolation was not immediately clear and the man’s identity was not disclosed. But it occurred in public view, on a central national gathering place, in a city still rattled by a mass shooting last month and a high-speed car chase outside the U.S. Capitol on Thursday that ended with a woman being shot dead by police with a young child in the car.