World leaders at WW1 centenary events in UK and Belgium

Royals and world leaders have gathered for ceremonies marking 100 years since Britain joined World War One.

The Duke and Duchess of Cambridge, Prince Harry and David Cameron attended a twilight ceremony at St Symphorien Military Cemetery near Mons, Belgium.

The Prince of Wales and the UK prime minister were at a Glasgow service, and many heads of state were in Belgium.

The day concludes with a candle-lit vigil at Westminster Abbey and a "lights out" event around the UK.

'Deadly days'

The public can join the hour-long switch-off which ends at 23:00 - the time Britain declared war on Germany in 1914.

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Some of the highlights of WW1 centenary events in the UK, Belgium and Singapore

About 17 million soldiers and civilians were killed between 1914 and 1918.

The day's events began in Liege where 50 heads of state gathered for a service to mark the invasion of Belgium.

French President Francois Hollande said the country had been the first battleground of WW1 and had offered "solid resistance" in Liege.

"Deadly days" followed when French and British soldiers joined the conflict, he said.

The Last Post was played at St Symphorien Military Cemetery near Mons

Prince William said European countries which had fought bloody wars were now "friends and allies"

David Cameron gave a Bible reading at Glasgow Cathedral earlier in a service attended by Prince Charles

Prince Harry attended the unveiling of a memorial arch in Folkestone

A white rose was laid at the Mons grave of the first British soldier to die in western Europe, John Parr

Speaking to the gathered European leaders, Prince William said: "We were enemies more than once in the last century and today we are friends and allies.

"We salute those who died to give us our freedom. We will remember them."