An activist from the Femin movement on Sunday objected to the convoy of US President Donald Trump in Paris on a live broadcast.
The French TV channel TF1 broadcast live on the air when the activist crossed the presidential procession while en route to the Arc de Triomphe on Champs-Elysées to participate in the commemoration of the truce that ended the First World War.
French police said they arrested the activist and another woman after they approached the US president's convoy.
The two protesters, who wrote on their chests, jumped "hypocrisy" over security barriers as the Trump drove past the crowd.
Trump raised much of the controversy earlier with remarks deemed offensive to women.
Trump and scores of world leaders are celebrating the 100th anniversary of the truce that ended the First World War, which killed nearly 17 million people between a soldier and a civilian.
The ceremony began at 11 am on 11 November. On that day in 1918, the guns on the western front were silent and the end of the bloodiest conflict in history, which lasted 4 years and claimed the lives of 10 million fighters and 7 million civilians, was declared.
During the anniversary of the signing of the truce that ended the war, and in a rare show of emotion, the hands of Macron and Merkel joined Saturday, Sunday, representing two countries that were rivals in that war.
The celebrations will see reading of testimonies written by soldiers on this day 100 years ago and when the cease-fire came into effect and will be read to high school students in three languages: French, English and German.
World War I, apart from being one of the bloodiest conflicts in history, reshaped Europe's politics and population for 20 years before the world saw the outbreak of World War II.
