"Aerial footage released on Monday reveals the scale of devastation on the railway tracks in southern Spain's Adamuz after a catastrophic train collision left at least 39 people dead and nearly 300 injured. Footage shows search and rescue teams combing through the wreckage, while authorities investigate the cause of the tragic accident. According to the rail infrastructure manager Adif, the accident began when the tail end of an Iryo high-speed train travelling from Malaga to Madrid derailed. The derailed carriages spun onto an adjacent track, crashing into an oncoming Renfe Alvia train travelling from Madrid to Huelva. The first train, Iryo 6189, was carrying around 300 passengers, the operating company said, while authorities confirmed that around 400 passengers and staff were onboard both trains at the time of the collision. The exact cause of the crash remains unknown. Speaking to reporters at Atocha station in Madrid, Spanish Transport Minister Oscar Puente said investigations are underway to determine what led to the derailment. Prime Minister Pedro Sanchez said Spain was facing a 'night of deep pain,' as condolences poured in from across the country. He also declared three days of mourning starting Tuesday. Sunday's disaster is Spain's deadliest rail accident since 2013, when a high-speed train derailed near Santiago de Compostela, killing 80 people."