Taxi drivers claim a loss of 30-40% in income due to the growth of Uber.
Protests against Uber have sparked riots in Paris and Marseille as French taxi drivers took to the streets.
Roads have been blocked to Paris airports, with blockades and tyres set alight prompting riot police to fire tear gas at some of the rioters.
Uber, the U.S. taxi appm, has been expanding its UberPOP ride-sharing service in France, despite government objections, much to the anger of taxi drivers who have to pay thousands of euros for a licence.
The objection is that they are being unfairly undercut by Uber, which is not licensed by authorities.
Almost 500 legal cases have been filed regarding complaints about UberPOP and the anger aimed at the company has resulted in about 100 attacks on Uber drivers and passengers in recent weeks.
Abdelkader Morghad, a representative of the FTI taxi union, told Bloomberg: "Many taxis drivers are infuriated. We’re demanding that the Thevenoud law, which clearly forbids unlicensed drivers, be implemented. There’s a lack of political will to do it."
According to Morghad, licensed drivers in France have lost between 30% and 40% of their income over two years because of the growth of Uber.
Courtney Love, the widow of Nirvana front man Kurt Cobain tweeted her distress at being caught up in the violence, saying: "They’ve ambushed our car and are holding our driver hostage. They’re beating the cars with metal bats, this is France?? I’m safer in Baghdad."
Uber says that it has a million users in France, including 250,000 for its popular basic UberPOP service.