What is this?

Today when I was returning home I decided to take a walk along the river and take some pictures from the other side of the river.

To my astonishment I noticed that there was something strangely shaped in the sky.

Initially I was thinking that it could be a cloud in a different format, but when I started to zoom in I realized that the origin was from the ground towards the sky.

This led me to think that it could be a forest fire since here in Portugal it's summer and it's always a time when several forest fires occur. However, when I got home there was no news about this event so I still don't know what caused this.

Here are some photos documenting what happened.

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