Spanish Prime Minister Pedro Sanchez has promised to get to the bottom of why two high-speed trains collided in southern Spain killing at least 40 people, as rescuers continue to search the wreckage, the BBC reports.
After visiting the site of the crash, Sanchez also announced three days of national mourning for victims.
More than 120 more people were injured as carriages on a Madrid-bound train derailed and crossed over to the opposite tracks, colliding with an oncoming train in Adamuz on Sunday evening.
The crash is the worst the country has seen in more than a decade.
