One of the drivers of a train which derailed in north-western Spain killing at least 78 passengers has been put under formal investigation. Security camera footage showed the Madrid to Ferrol train hurtling around a bend before flipping on to its side. More than 160 people were hurt, at least 32 seriously in the incident near Santiago de Compostela. Spain will hold three days of mourning over the crash, one of its worst. The black box of the train is now with the judge in charge of the investigation.