Forest fires in New York City are nearly unprecedented. None have been recorded in Prospect Park in recent history, and while wildfires are part of the natural cycle in some parts of the country, they’re extremely uncommon in urban forests.

The fire was in an “extremely dense” part of Prospect Park on a hill, and there were no structures nearby to be threatened, an FDNY official said.

On Friday night, flames could be seen piercing through trees in the 526-acre New York City park in the middle of the borough.