Media playback is unsupported on your device Media caption People gather to observe two minutes' silence and pay tribute to those who have died in war since WWI

Millions of people across the UK have observed a two-minute silence to mark Armistice Day.

Ceremonies have been taking place to honour all who have fallen since WWI, including the 111 servicemen killed in Afghanistan in the past year.

In London, a service was held for the 90th time at the Cenotaph memorial.

Meanwhile, David Cameron has laid a wreath at the site of the Army's bloodiest battle since the end of WWII - at the Imjin River in South Korea.

A total of 93 men from the 1st Battalion, Gloucestershire Regiment, died either during the battle or in captivity after being cut off by Chinese communist forces.

Image caption Mr Cameron attended the War Memorial of Korea, alongside Black Watch veteran WO Peter Johns

But the battalion's defensive efforts ultimately helped prevent a direct assault on the capital, Seoul.

The prime minister, who is in the country for a G20 summit, spent several moments in contemplation at the memorial in what is now known by Koreans as Gloster Valley.

The service at the Cenotaph was attended by the Archbishop of Canterbury, defence ministers, representatives of military associations, veterans and schoolchildren.

Led by Brother Nigel Cave, the Western Front Association's padre, it involved wreaths being laid at the monument in Whitehall.

A bugler from the Scots Guards heralded the start of the silence at exactly 1100 GMT by playing the Last Post. Its completion was marked with the Reveille.

Music and readings

Other events included the Duke of Edinburgh visiting the Field of Remembrance and the Grave of the Unknown Warrior at Westminster Abbey.

A service of remembrance also took place at the National Memorial Arboretum in Staffordshire.

Battle of Imjin River The three-day battle, from 22 April 1951, was the British army's bloodiest since WWII but proved pivotal to the Korean War. The 1st Battalion, Gloucestershire Regiment, were surrounded by Chinese communist forces. Running short of water and ammunition, the "Glorious Glosters" held their hilltop position throughout a full day and a night, repelling waves of Chinese attackers. The battalion lost 59 men and 526 were taken prisoner - 180 of them wounded. Another 34 died in captivity. But their stand delayed the advance of the Communist troops, preventing them from outflanking the UN and Republic of Korea forces who could then prevent a direct assault on Seoul. The 29th Brigade, of which the Glosters formed part, suffered 1,091 casualties, dead, wounded or missing during the Imjin River offensive. Chinese casualties numbered around 10,000. A total of 1,078 UK troops died and 2,674 were wounded during the Korean War from 1950-53.

Meanwhile, the Royal British Legion hosted Silence in the Square, giving people the chance to take part in the two-minute silence to remember troops past and present, and share in music, readings and entertainment.

The event in London's Trafalgar Square features pop band The Saturdays, TV presenter Ben Shephard and actors Keeley Hawes and Ben Barnes.

On Wednesday evening, British journalists who have died reporting conflicts around the world were honoured for their bravery in a London memorial service attended by the Duchess of Cornwall.

The duchess joined families of reporters and cameramen killed over the past decade to commemorate their sacrifice "in the pursuit of truth".

A host of media figures packed into St Bride's Church on Fleet Street the former home of many of Britain's national newspapers, for the ceremony of remembrance.

On Tuesday, the first remembrance field dedicated to the British servicemen and women killed in Afghanistan was opened by Prince Harry.

The prince also planted a cross in the Royal British Legion Wootton Bassett Field of Remembrance, at Lydiard Park, Wiltshire.

The 342 UK service personnel who have lost their lives in the conflict were honoured with a two-minute silence.