Union leaders have announced that tens of thousands of workers within the Los Angeles Unified School District (LAUSD) are set to go on strike for three days next week. The announcement comes after stalled contract talks.

The strike, which is expected to include teachers, is likely to result in the shutdown of the nation’s second-largest school system. The announcement was made on Wednesday during a rally by the Service Employees International Union. The union represents approximately 30,000 teachers’ aides, bus drivers, custodians, cafeteria workers, and other support staff.

If there is no resolution, the strike will commence on Tuesday, March 21. The United Teachers Los Angeles, the union representing 35,000 teachers, counselors, and other staff, expressed their solidarity with the planned action and are expected to join in. The strike is expected to result in the shutdown of schools for the duration of the work stoppage.