[Updated at 6:43 p.m. ET] Delegates for striking Chicago Public Schools teachers voted overwhelmingly Tuesday to suspend their nine-day strike, meaning classes will resume Wednesday, according to delegates who attended a union meeting.

About 800 delegates from the teachers union gathered at midafternoon to vote on whether to suspend the walkout, which began September 10.

The vote came a day after school officials asked a judge to declare the strike illegal and order the teachers back to work. A Cook County judge had scheduled a hearing on that request Wednesday.

Any contract agreement with the school system would need to be ratified by the more than 29,000 members of the union. The strike has kept about 350,000 students out of class for seven school days.

Teachers walked off the job September 10, objecting to a longer school day, evaluations tied to student performance and job losses from school closings.