The train driver in last week's crash in Spain was talking on the phone when it derailed, investigators say.

The train was travelling at 153km/h at the time, investigators at the Court of Justice of Galicia said.

Francisco Jose Garzon Amo was speaking to members of staff at the state-owned railway company, Renfe, they added.

Crash investigators had opened the train's "black-box" data recorder to find the cause of the crash, which left 79 people dead.

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