LOS ANGELES (AP) - Some 150 Huntington Park High school students have left their classrooms and are marching east along Firestone Boulevard in South Gate to protest an immigration bill due before Congress on Monday.

TV images show a line of students over a half-mile long, carrying flags and swarming television camera operators.

Today's march comes a day before a larger rally planned in LA tomorrow, when immigrant-rights groups will gather to protest the legislation.

The bill seeks to build more walls along the US-Mexico border and make helping illegal immigrants a criminal offense.