A train driver has been killed and 20 people injured after a commuter train derailed near Barcelona.
A retaining wall "collapsed on to the tracks", causing the incident, the region's civil protection agency said on social media.
The accident occurred just two days after a train collision killed 42 people in southern Spain and injured dozens.
Four people are described as being in a critical condition following the latest incident on Tuesday night, and one is in a very critical condition, emergency services said.
Twenty ambulances were dispatched to the site near Gelida, on the outskirts of Barcelona, along with 38 firefighter units, emergency services said.
The train was travelling south between Gelida and Sant Sadurni d'Anoia, according to Spanish newspaper El Mundo.
The injured have been taken to the Moises Broggu, Bellvitge, and Vilafranca hospitals, the newspaper reports.
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Catalonia's fire service confirmed "no one remained inside" the train carriages after conducting a review of the site.
"We are reviewing the underside of the train and conducting a sweep of the area to rule out any further victims," it said on X. "We continue securing the area to work safely."
Spain's railway operator ADIF said the containment wall likely collapsed due to heavy rainfall across the northeastern Spanish region of Catalonia this week.
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The suburban train derailment occurred in a region that has struggled for a long time with underfunded rail services and frequent incidents, Reuters reports.