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King Juan Carlos has said all Spanish people feel the pain of the families of the 80 people killed in a high-speed train crash in north-western Spain, BBC reported. 

The king was speaking on a visit to the dozens of hospitalised survivors in Santiago de Compostela, near to where the train derailed on Wednesday night.

PM Mariano Rajoy, who hails from the city of the crash, declared three days of official mourning on Thursday.

One of the train drivers is under formal investigation, officials say.

The driver, named by Spanish media as Francisco Jose Garzon Amo, was lightly injured and will be questioned by police in hospital, the Galicia Supreme Court said in a statement.

Spain's national train operator Renfe said it was too early to say what caused the train to derail. However, survivor accounts and media reports suggest the train was travelling at excessive speed as it hit a curve in the track.

Footage captured by a security camera shows the train crashing as it hurtled round a bend.

King Juan Carlos and his wife Queen Sofia visited survivors and the families of victims at Santiago's University Hospital on Thursday.

"All Spanish people join in the sorrow of the relatives of the deceased," he said, praising what he called the spirit of citizenship shown by rescue workers and blood donors.

Prime Minister Mariano Rajoy was at the scene of the crash on Thursday.

"For a native of Santiago like me, this is the saddest day," he said.