A two-train crash in southern Spain has resulted in at least 41 fatalities and over 120 injuries. Heavy machinery is being used for recovery efforts as rescuers fear more bodies may be trapped. Investigations are focusing on a faulty weld as a potential cause. Prime Minister Pedro Sanchez has canceled his trip to address the disaster, while King Felipe and Queen Letizia plan to visit the site. Three days of national mourning have been declared.