(Reuters) The Chicago Teachers Union has sued the nation’s third largest school district, saying Mayor Rahm Emanuel’s campaign to reform or close underperforming public schools discriminates against African-American teachers and staff.

The federal lawsuit filed on Wednesday and announced on Thursday is the latest battle with the city since teachers staged a week-long strike in September. It alleges that more than half of the tenured teachers fired in the most recent round of school closings and turnarounds were African American.

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