On Tuesday, police had to intervene during a heated protest conducted by French taxi drivers who are angry over increased competition from private car services. In addition to protests by taxi drivers, air traffic controllers also walked off the job along with teachers as part of a larger strike by state employees. As a result, 20% of flights were cancelled and many schools were disrupted. Nearly 20 people were arrested as a result of the protests.
See "French Protests and Strikes Disrupt Airports, Roads, Schools", The New York Times, January 26, 2016