British authorities have imposed a 30-day ban on protest marches which will go into force on Friday. Starting September 2, protest marches are prohibited in the boroughs of Tower Hamlets, Newham, Waltham Forest, Islington and Hackney. The boroughs were wracked by violent riots and looting that hit London and several other British cities in early August. The disorder was triggered by the deadly shooting of London resident and suspected drug dealer Mark Duggan. More than 1,600 people were detained during the ensuing rioting.