The International Day Against Police Brutality occurs on March 15. It first began in 1997 as an initiative of the Montreal-based Collective Opposed to Police Brutality and the Black Flag group in Switzerland. In Montreal, a march is usually held which defies law P6 by not declaring its itinerary to police. In 21 years the march has only avoided arrests and hassling twice. The protest is immediately declared illegal and crackdown begins shortly after the protesters have gathered. Hundreds of people are arrested most years. The police use kettling, batons and are dressed in riot gear.