Washington (AFP) – The police chief in the US city of Atlanta resigned after an officer fatally shot a black man during an arrest, the mayor said Saturday, with the new killing injecting fresh anger into protests against racism and police brutality.Demonstrators blocked an interstate highway and set alight the Wendy’s where 27-year-old Rayshard Brooks was killed late Saturday, local media reported. This came hours after Mayor Keisha Lance Bottoms — who has been touted as a potential running mate for Democratic presidential candidate Joe Biden — announced the resignation of Chief Erika Shield…