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More than 800,000 ceramic poppies are being planted at the Tower of London, to commemorate the British servicemen and women who died during the First World War.

These incredible pictures show a river of red flowing out of the historic tower and into the moat. The flowers cover the grass and have already attracted thousands of onlookers ahead of its grand opening.

PA

The installation, "Blood Swept Lands and Seas of Red", was officially unveiled on August 4 th and when finished it  includes 888,246 ceramic poppies.

The artwork - part of events to mark the 100th anniversary of Britain's involvement in World War I -  the final poppy will be planted on November 11, Armistice Day.

The ever-changing installation is the brainchild of ceramic artist Paul Cummins, with help from stage designer Tom Piper. Each poppy represents a British or Colonial military fatality during the war.

A spokesman for Historic Royal Palaces said: "The poppies will encircle the Tower, creating not only a spectacular display, but also an inspiring setting for learning activities, as well as providing a location for personal reflection. The scale of the installation reflects the magnitude of such an important centenary, creating a powerful visual commemoration."

The remarkable display has already received widespread praise, with hundreds of people posting their own pictures on  social networks  .