Police in Spain have officially detained the driver of the train that crashed on Wednesday, killing at least 78 people.

The driver is now under guard in the hospital where he is being treated for minor injuries.

A police spokesman says Francisco Jose Garzon Amo will be questioned “as a suspect for a crime linked to the cause of the accident.

Investigators also have recovered the two “black boxes” from the wreckage. They expect they will provide some clues as to why the train was travelling well above the speed limit when it crashed near Santiago de Compostela.