The driver of a train that derailed on Wednesday killing 78 people has been formally detained, Spanish police say.
The driver, who was injured and is under guard in hospital, is accused of "crimes related to the accident", they say.
There are reports that the train was travelling at more than double the speed limit at the time of the crash.
Spain has declared three days of national mourning over the crash, one of its worst-ever rail disasters.
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