A Chicago Teachers Union member asks a parent for support in ongoing contract talks with the Board of Education during an informational picket outside Willa Cather Elementary School on Monday, Aug. 20, 2012 in Chicago. (AP Photo/Sitthixay Ditthavong)

CHICAGO (AP) — The Chicago Teachers Union says it has filed a grievance against the public school district for imposing changes in working conditions before a contract is reached.

The CTU said Wednesday it filed an unfair labor practice charge with the Illinois Educational Labor Relations Board. They claim the district cancelled annual longevity pay increases, discontinued a longevity sick leave benefit and imposed new teacher evaluations.

The union says state law bars employers from changing working conditions while bargaining is ongoing. The union wants a preliminary injunction ordering the district to rescind the changes.

Spokeswoman Becky Carroll said district officials are “disappointed” by the union’s action.

Teachers say they’ll strike Monday if a contract agreement isn’t reached by midnight Sunday. They reaffirmed the strike date late Wednesday after a union delegates meeting.

Copyright 2012 The Associated Press.

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