People are being invited to hold a minute's silence to "mourn and reflect on the life and legacy of Queen Elizabeth II".
The Prime Minister's official spokesman said: "At 8pm on Sunday 18 September, the night before the state funeral, there will be a one-minute silence where the public are invited to come together and observe a national moment of reflection to mourn and reflect on the life and legacy of Queen Elizabeth II. The silence can be marked privately at home on your own or with friends and neighbours, out on your doorstep or street with neighbours, or at any locally arranged community events and vigils.
"We encourage local community groups, clubs and other organisations to mark this moment of reflection. And if you are overseas, people are encouraged to mark the silence at their local time.
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"The shared national moment of reflection is an opportunity for everyone across the UK to mark the death of Her Majesty and we will set out details of where the Prime Minister will mark it closer to that time."
The announcement from Downing Street comes as preparations are made for the Queen's lying in state in London. Millions of people are expected to line up and pay their respects to the late monarch in the coming days.
Infrastructure for the queue is being set up so the public can view the Queen's coffin in Westminster Hall from Wednesday evening to Monday morning before her funeral. Full details on the queue will be released at 10pm on Tuesday ahead of its opening on Wednesday at 5pm.
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