Spain has begun three days of mourning after at least 69 people were killed and more than 100 were injured in a crash between two high-speed trains. The town of Urda has become the site of a major operation, as emergency services continue to search through the wreckage and relatives wait for news of their loved ones. There is growing public anger over the incident, which is the second fatal train collision in Spain in less than a year. Lucy Hough speaks to the Guardian’s Madrid correspondent, Sam Jones