What are police and bodyguards looking for in the crowds at the Queen's funeral?
A royal security expert described potential terrorists as people who would seem 'blatantly out of place' and uninterested in ceremonial events.
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Queen’s lying in state will be ‘massive challenge’ for police
Sir Mark Rowley said the operation, which will involve thousands of officers, was something 'we have been preparing for many, many years'.
London set for 10,000 police officers on daily duty ahead of Queen's funeral
Large crowds gathering to mourn the Queen in the coming days and her funeral itself will involve a complex policing and security plan.