Chicago activists have warned a sprawling anti-violence protest may lead to multiple arrests and the shutdown of busy streets. The demonstration was being organised in an effort to unseat Rahm Emanuel, Chicago’s Democratic mayor, and Eddie Johnson, the city’s police superintendent, according to organisers. Protestors planned to march from Lake Shore Drive to Wrigleyville in the middle of Thursday rush hour, and had not ruled out entering the Wrigley Field, where the Chicago Cubs were scheduled to play against the San Diego Padres.