Video footage posted Saturday on Twitter shows men in dark hoodies dousing a police van with flammable liquid to stoke a larger fire. El Mundo newspaper reported that a driver was inside the van as the rioters caused the fire to spread.
Video shot from another angle near the same scene shows people throwing bottles, flares and other objects at a group of police vehicles and spray-painting the vehicles with anarchist symbols.
The larger fire is then sparked as a person throws flammable liquid on the van.