The Duchess of Sussex had pulled out of giving a speech with Prince Harry at the event promoting children's online safety.
Officers attended the scene in connection with a separate incident at a residential building in the city.
The contents of the calendar, including hair clips and keychains, have been widely criticised on social media.
The president says the US is keeping "status quo" with Iran but remains “locked and loaded” should the situation change.
Police say they have detained a 47-year-old suspect and no one was injured in the incident.
M John Harrison becomes the oldest ever winner of the prestigious literary award at the age of 81.
Evacuation comes weeks after US withdrew bombers from RAF Fairford over suspected Iran-linked security incidentThe US mi...
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