It may be unexpected, surprising, formerly secret, and may come from an exclusive source. Events witnessed by many people generally cannot become scoops, (e.g., a natural disaster, or the announcement at a press conference).
It may be unexpected, astonishing, previously unknown, and possibly from a privileged source. Events observed by many people typically cannot become scoops, (e.g., a natural calamity, or the announcement at a press conference).