'Yellow vest' protesters clash with police in Rouen Between 1,000 and 2,000 "yellow vest" protesters take to the streets in Rouen, where clashes broke out with riot police. A demonstrator was hit in the head by shots from defensive ball throwers and at least two others have been arrested. Two barricades of construction equipment and garbage cans were erected on the city's main street, one of which was set on fire. IMAGES.