WASHINGTON - The US government has sued a Chicago school for denying a Muslim woman teacher unpaid leave to perform Haj, according to a media report. In a civil rights case, the Department of Justice said the school in Berkeley denied the request of Safoorah Khan on grounds that her requested leave was unrelated to her professional duties and was not set forth in the contract between the school district and the teachers union. In doing so, the school district violated the Civil Rights Act of 1964 by failing to reasonably accommodate her religious practices, the government said. Safoorah Khan started as a middle school teacher for Berkeley School District 87 - about 15 miles west of Chicago - in 2007. In 2008, she asked for almost three weeks of unpaid leave for Haj. After the school administration twice denied her request, Ms. Khan wrote to the administration that based on her religious beliefs, she could not justify delaying performing Haj, and resigned shortly thereafter, according to the lawsuit filed in federal court in Chicago.