THE nation has fallen silent to honour thousands of soldiers killed in the Battle of the Somme 100 years after the bloodiest day in British military history.

Ceremonies across the UK honoured the hundreds of thousands of victims of the brutal offensive which started in northern France on July 1 1916.

The two-minute silence ended at 7.30am, the time when the British, Commonwealth and French forces went "over the top" a century ago.

The British Army suffered almost 60,000 casualties on the first day alone and more than a million men would be killed or wounded on both sides over the course of the 141-day offensive.

The silence came after a night-long vigil across Britain, launched on Thursday by the Queen at a Westminster Abbey ceremony, and at the Thiepval Memorial to the Missing of the Somme, which towers over the rolling Picardy fields where so many fell.

Senior royals including the Prince of Wales and Duchess of Cornwall, the Duke and Duchess of Cambridge and Prince Harry will join Prime Minister David Cameron, French president Francois Hollande and other leaders at the memorial later for a service of remembrance in front of an audience of 10,000.

In London, people lined Parliament Square, where the roar of guns was followed by the two-minute reflection.

People huddled under trees and umbrellas paused from their journeys to stand quietly.

The King's Troop Royal Horse Artillery were present, having been at Thiepval on Thursday night.

The soldiers manned three sets of guns, drawn into place by horses, and fired every four seconds for 100 seconds.

Whistles were blown and Big Ben chimed when the two minutes were over, though many still continued to pause in reflection.

In Edinburgh, a two-minute silence was held at Scotland's National War Memorial, with descendants of some of those who died at the Somme in attendance.

In Redditch youngsters and the Royal British Legion will lay wreaths to remember those who died ater today.

The memorial event - open to anyone who wishes to attend - will take place at the war memorial in Plymouth Road, Redditch, at 12 noon.

A special exhibition, part of the Bromsgrove Festival, starts today in Bromsgrove Library about local people who were at the Somme.

For more information, visit bromsgrovefestival.co.uk.