Officials and citizens are gathering at memorials across Europe to pay tribute to the millions of soldiers killed during World War I on the 97th anniversary of the war's end.

Thousands of people lined Paris' Champs Elysees boulevard to see President Francois Hollande lay a wreath at the Arc de Triomphe, where an eternal flame marks France's Tomb of the Unknown Soldier.

Smaller ceremonies were being held across France, where church bells toll to mark the hour when the armistice was signed Nov. 11, 1918, and memorials list the names of each village's dead.

An estimated 10 million soldiers and other servicemen were killed in the 1914-1918 war, of whom 1.3 million were French. Millions, of many nationalities, lie buried across France's north and east along the war's Western Front.