evidence: Despite the appalling death toll, serious questions remain unanswered by Spain and Morocco over what happened. Spain continues to deny that any deaths took place on its territory and has given only a partial account of its role despite having at least two sources of aerial footage documenting the events that unfolded on the day. [...] With reporters on the ground on both sides, in Morocco and Melilla, we traced 40 of the witnesses and survivors from the day to gather testimony. We also conducted confidential interviews with senior officers in the Guardia Civil, Spain’s national police force. They hand drew sketches of the border for us, and described how the events of June 24 unfolded. In Melilla, a high-ranking officer told us that deaths "probably" took place in Spain. This is the first time a police official in Spain has made an admission of this kind. [...] Despite the many injuries sustained on the day – some of them fatal – medical assistance was not mobilised in time to help people in Morocco or Spain. In Melilla, an ambulance was parked 100 metres from the border, but officials said they couldn’t get closer for safety reasons. In Morocco, ambulances were present throughout the day, but they were reportedly used predominantly to remove dead bodies.