Eric Drouet, a truck driver from the suburbs of Paris, was arrested in Paris on Wednesday evening near the iconic Champs-Élysées avenue - a prime location for the yellow vests to gather. Drouet was detained while leading a commemoration of yellow vests who have died since the movement's inception, most of whom were hit by cars during protests at roundabouts throughout the country, according to the Wall Street Journal. 

"The arrest and detention of Mr. Drouet is completely unjustified and arbitrary," said Drouet's attorney in a Thursday statement. 

The coming weeks will test whether Mr. Macron's government can stop the protests, which have slowed the French economy and are undermining his plans for a free-market overhaul of France. Participation waned during the holiday season, but yellow vests are organizing new demonstrations this Saturday in Paris and elsewhere. Protesters continue to camp out at roundabouts across the countryside.

The government has struggled to contain the grass-roots movement, which has no organized leadership and has refused to declare demonstrations to the authorities as required by French law.