The Queen has joined British veterans at Bayeux cemetery in Normandy, to honour those who took part in the D-Day landings 70 years ago.
David Cameron said he felt a mixture of "awe and gratitude" as he met veterans of the D-Day landings at a memorial service in Bayeux.
The Prime Minister said it was "incredibly moving" to be at the events in Normandy and it was "humbling" for people of his generation who had not had to do anything like the heroic actions of June 6, 1944.
The Band of the Parachute Regiment tweeted from Ranville War Cemetery in France:
US Secretary of State John Kerry has arrived at a cemetery in Colleville-Sur-Mer to attend a memorial service for American veterans.
HMS Belfast will play its part in commemorating the 70th anniversary of D-Day today by hosting a formal ceremony for veterans.
There will also be a fly-past over the River Thames.
Veterans from the D-Day landings are being hosted at a lunch on board HMS Belfast today.
The ship has only recently been re-opened to the public after the gangway collapsed into the River Thames in November 2011.
D Day Veterans from Hillingdon are piped aboard HMS Belfast on the 68th anniversary of the Normandy Landings.
They are attending a special lunch on board the ship.
Veterans of the Normandy landings will today be treated to a special lunch on board HMS Belfast.
The event is being staged by Hillingdon Council, with big Lottery Funding, to mark the anniversary of D Day and the Queen's Diamond Jubilee.