Trade unions and other groups staged rallies around the world to mark International Workers' Day, with violence breaking out in Paris on the fringes of one protest.
Fearing France's worker protections are under threat, hundreds of angry youths on the sidelines of a rally hurled stones and wood at police in the capital, receiving repeated bursts of tear gas in response.
In Russia, tens of thousands of people marched across Moscow's Red Square in a pro-Kremlin workers' rally. The protesters were carrying the Russian tricolours and balloons.
In Turkey, police used tear gas and water cannon to disperse dozens of May Day demonstrators in Istanbul.
Small scuffles broke out between police and demonstrators trying to reach Istanbul's Taksim Square.
In the Istanbul districts of Sisli and Bakirkoy, police fired tear gas and water cannon to scatter other protesters. They also rounded up at least 36 demonstrators, according to Anadolu Agency.
May Day rallies were held across the Philippines, with campaigning entering the final week ahead of the May 9 presidential election. Some of the candidates pledged to address labour complaints.
In Taipei, Taiwan's capital, labour unions took to the streets with a march to call on the government to reduce working hours and increase wages.