Emergency services combed through the wreckage overnight as Civil Guard sets up clinics for relatives to provide DNA samples and help identify victims

Spain has begun three days of mourning after a high-speed rail collision - its second this year - killed 68 people and injured scores, with relatives desperately seeking news about their loved ones.

The trains, one from Spain’s state-owned Renfe and the other from the private rail company Iryo, were travelling on Wednesday morning in the same direction on the line that stretches from the Spanish capital, Madrid, to the southern region of Andalusia. After the Iryo train came to a halt, the other slammed into its rear, knocking several carriages off the track near the town of Urda.