The violent protests during the visit of the Spanish royal couple and Prime Minister Sánchez to the flood disaster area may have been organized by right-wing extremist groups.

As the Spanish Interior Minister Grande-Marlaska explained, there are clear indications of this.

Deutschlandfunk (German source)

Another source (DPA, English)

Go ahead, I don’t mind. I’m glad you like my idea.

It would have been cool to involve the community by doing some kind of art contest. (Not saying I would participate, I just like the idea.)