French prosecutors launched Wednesday a preliminary probe into alleged police violence after a video showing police tripping a pension reform protestor went viral, according to local media. 

General Inspectorate of the National Police (IGPN), France’s police watchdog group, will investigate the video, allegedly recorded in Toulouse on Jan. 9, and the police violence during protests, the daily LeMonde reported.

Police violence in France has been a subject of controversy since the Yellow Vest protests which started in Nov. 17, 2018 and continue to be the main focus because of the ongoing pension reform protests since Dec. 5.

On Tuesday,

Read more: French police facing probe for violence during protests