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Lights at hundreds of landmarks have been turned off to commemorate the moment Britain joined the First World War.
The lights on some of Britain's most famous landmarks have been switched off for an hour tonight to remember the 17 million who gave their lives in the First World War.
Tower Bridge, the Houses of Parliament and St Paul's Cathedral all went dark from 10 pm.
Britain officially declared war on Germany at 11pm on August 4, 1914. The conflict lasted four years.
Lights across Britain have been switched off for an hour tonight in a tribute to the 17 million killed in the First World War.
Landmarks including the Houses of Parliament, Tower Bridge and St Paul's Cathedral all went dark from 10pm.
Prime Minister David Cameron had asked Britons to switch off all but a single light in their homes for an hour.
A single candle has been placed outside Number 10 ahead of the Lights Out campaign.
The 14-18 NOW Lights Out campaign hopes people will leave a single light on between 10 and 11pm to mark the exact hour when Britain declared war on Germany.
The great majority of the millions of casualties in the First World War were on the frontline - from the mud of Flanders to the trenches on the Somme. But sometimes civilians lost their lives too - right here in the West Midlands.
Giant airships - or zeppelins - flew over and dropped bombs. In one such air raid 35 people were killed and many more were injured when Wednesbury, Tipton and Walsall were attacked by mistake. Keith Wilkinson reports.
Number 10 is among the buildings that will turn their lights out in an hour's time to mark the moment Britain declared war on Germany and joined the First World War.
Are you joining in the Lights Out event? Post pictures of your "moment of reflection" on our Facebook page.
A lone bugler played The Last Post during a moving ceremony at St Symphorien military cemetery near Mons, Belgium.
War must always represent the abject failure of humanity, the head of the Anglican church in Ireland has said.
Archbishop of Armagh Dr Richard Clarke said commemorating the First World War could not be spiritually separated from the situation in Gaza and other recent conflicts.
Dr Clarke said: "War must always represent the abject failure of the human spirit and of humanity itself.
"It can never be other and we should never pretend it is other."
The Duke of Cambridge and David Cameron have laid wreaths during a twilight ceremony commemorating the First World War.
Latest ITV News reports
As the Lights Out event to remember those who fought and died in WWI happened last night ITV asked our viewers what they did to take part.