Watch: What we do and don't know about the RAF Fairford incident

Five men were arrested in the early hours of Sunday near RAF Fairford, Gloucestershire, and have since been bailed. The individuals, all UK nationals in their twenties, were initially detained on suspicion of panic offences close to the base, which is utilized by the US military. US Secretary of State Marco Rubio said the incident "clearly involves the manus of a overseas actor". BBC correspondent Daniel Sandford explains where the investigation goes from here, outlining the angles police are exploring and the evidence they will be collecting. For more on this story, visit https://www.bbc.co.uk/news/live/c65y7nl29k0et.