Demonstrators burn flares, on strike to reject a government reform relaxing the 35-hour workweek and other labor rules. 示威者燃燒訊號彈, 罷工以拒絕政府放寬每週35小時工作等勞動規則的改革

Demonstrators burn flares during a protest in Paris, March 31, 2016. Some French train drivers, teachers and others are on strike to reject a government reform relaxing the 35-hour workweek and other labor rules. (AP Photo/Christophe Ena)
Protesters clash with French police over labor reforms
https://www.yahoo.com/news/photos/protesters-clash-with-french-police-over-labor-reforms-1459441122-slideshow/

Flare - Wikipedia, the free encyclopedia

發焰筒（英語：Flare）又名發炎筒及訊號彈