Smoke and heat from a massive wildfire in southeastern Oregon in the US are creating giant "fire clouds" over the blaze â dangerous columns of smoke and ash that can reach up to 10km in the sky and are visible from more than 160km away.
Authorities have put these clouds at the top of the list of the extreme fire behaviour they are seeing on the Bootleg Fire, the largest wildfire burning in the US.
The inferno has grown to about 194 square kilometres, larger than the size of New York City, and was raging through a part of the US that is enduring a historic drought.