Two teenage graffiti artists have been doused with a fire extinguisher after being spotted spraying their artwork on a commuter train.
The youngsters were stood on the tracks with their hoods up spraying purple paint on to the white train.
A man, reported in the Spanish media to be the driver, then opened the carriage doors and covered the pair in the white substance.
A commuter who filmed the incident can be heard pleading with the man on board the train to stop.
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