The driver of the train which crashed and killed 78 people in Santiago de Compostela on Wednesday is refusing to answer questions from police, according to Spanish newspaper El Pais.
Jaime Iglesias, police chief in the Galicia region, said that driver Francisco Jose Garzon Amo is being questioned "as a suspect for a crime linked to the cause of the accident".
Spanish media say the injured driver, who is under guard in hospital, is accused of "crimes related to the accident".
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"People must be aware at all times that there are wild animals around them and they must make sure that their tents are properly closed."