At least 21 people have died in a train collision in southern Spain and left dozens more injured, as authorities warned the death toll could increase in Spain's worst rail collision in more than a decade.

Carriages on a Madrid-bound train derailed and crossed over to the opposite tracks, colliding with an oncoming train in Adamuz, near the city of Córdoba.

Four hundred passengers and staff were onboard both trains, the rail networks said. At least 24 people were seriously injured in the collision, including four children, according to Andalusia's emergency services.

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