In what situation is a book of condolence opened? Re Cumbria shootings

Ciaraella

Registered User
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213
Just thinking are there only certain situations when a book of condolence is opened? Like a national disaster or if a head of state dies etc?
I'd like to sign one for the people murdered in Cumbria and I wondered whether one would be opened in this kind of situation, presumably in the British embassy?