ORLANDO, Fla. Orlando Police Chief Orlando Roln and Orlando Mayor Buddy Dyer are expected to hold a news conference Wednesday after four days of demonstrations in the City of Orlando. On Tuesday, around 2,000 peaceful demonstrators outside Orlando City Hall chanted Black Lives Matter!" Nearly 50 minutes after the citys 10 p.m. curfew went into effect, Orlando Police said officers deployed tear gas and smoke after a few remaining participants started throwing rocks and bottles at them. MORE: Orlando police again use tear gas to disperse protesters who threw rocks, bottles at themDuring the protests, officers said a 29-year-old man attempted to stab officers with an exposed syringe. Officers said the incident happened around 7:30 p.m. while a crowd of protesters gathered at Robinson Street and Rosalind Avenue.