CHICAGO, Nov. 6 — A school superintendent’s decision to suspend, and perhaps expel, about two dozen students who took part in a protest against the Iraq war at a suburban high school drew criticism Tuesday from the students and their parents, who demanded that their children be allowed to return to classes.

In a statement issued after the protest on Thursday at Morton West High School in Berwyn, a working-class suburb just west of Chicago, the district superintendent, Ben Nowakowski, said the school’s reaction had to do only with the interruption of the school day, not with the students expressing themselves.

The administration “did not say that the students could not protest,” Dr. Nowakowski’s statement said. “Rather, we asked that the students simply move their protest to an area of the school that would not disrupt the ability of the other 3,400-plus students at Morton West to proceed with their normal school day.”

Dr. Nowakowski did not return repeated calls seeking comment Tuesday.

But several students said the protesters, whose numbers had dwindled to about 25, obeyed the administration’s request to move from a high-traffic area in the cafeteria to a less-crowded hall near the principal’s office. There, they intertwined arms, sang along to an acoustic guitar and talked about how the war was affecting the world, said Matt Heffernan, a junior who took part.