Australia
and New Zealand are remembering soldiers from the two countries who
fought at Gallipoli in Turkey during World War One.
Events throughout Saturday mark the centenary of the Allied attack on the Gallipoli peninsula.A dawn service was held at the landing. The two countries later remembered their dead at battlefield services.
More than 11,400 of Australian and New Zealand Army Corps (Anzac) troops were killed in the course of the campaign.
Australian PM Tony Abbott paid tribute to their selflessness, describing them as Australia's "founding heroes".
Anzac Day is arguably the most important national occasion for Australia and New Zealand.
Gallipoli holds a special place in Australian hearts. Many believe it was here Australians proved themselves the equal of any in the world, heralding the young nation's emergence onto the world stage.
Read more about events during the course of the day here.
Meanwhile in London, the Queen, the Duke of Edinburgh - who is patron of the Gallipoli Association - and Prince William were joined by senior government and military figures to lay wreaths at the Cenotaph in Whitehall.
The dawn service in Gallipoli was held under the shadow of the peninsula's mountains
About 131,000 - of whom 45,000 were Allied forces and 86,000 from Turkey - died in the campaign. The fatalities included about 25,000 British military personnel and 10,000 from France.
'Founding heroes'
Thousands from Australia and New Zealand are in Turkey for the anniversary along with Princes Charles and Harry and a large number of international dignitaries.Australians commemorated their dead with a service at Lone Pine, the site of a bloody battle on the Gallipoli peninsula in August 1915, while New Zealanders paid tribute at Chunuk Bair, a hilltop captured by the Allies in their only brief success of the campaign.
The Australian service began with schoolchildren reading out the names of some of the fallen.
In a speech, Prime Minister Abbott stressed the importance of the troops in Australia's history.
"To us they are Anzacs, but in their day they were fathers, sons, parents, children, cousins and mates just as you are now," he said.
"You walk among their headstones, you read the inscriptions, you hear the epitaphs and you hear their families speak - in these inscriptions and in these epitaphs we hear the echoes of our country a century ago."
The campaign has become synonymous with troops from Australia and New Zealand
At a dawn service to mark the landing, Mr Abbott described the Australian troops as the "founding heroes" of their country.
At the same event, New Zealand Prime Minister John Key said that Gallipoli had become a by-word for the best characteristics of Australians and New Zealanders "especially when they work side by side in the face of adversity".
A quotation by Mustafa Kemal Ataturk - the founder of the Republic of Turkey after the fall of the Ottoman Empire - was also read at the service.
"You, the mothers who sent their sons from faraway countries wipe away your tears; your sons are now lying in our bosom and are in peace.
"After having lost their lives on this land they have become our sons as well."
Thousands of miles away in Australia and New Zealand, dawn services and other events were also held on Saturday morning to mark the centenary of the landings amid tight security.
In Sydney, dozens of surf boats from Australia, New Zealand and Turkey took part in a symbolic re-enactment of the Gallipoli landings.
Events were held across Australia on Saturday morning in Brisbane....
...and in Melbourne where a dawn church service was held
In Sydney dozens of surf boats from Australia, New Zealand and Turkey raised their oars in tribute
"It is great to come here and share our mutual bonds together," he said.
More than 20,000 people in New Zealand attended a service at the national war memorial in Wellington, where Governor-General Jerry Mateparae was accompanied by Australian counterpart Peter Cosgrove.