More than 500,000 students in the Los Angeles Unified School District began a new school year Thursday with concerns and fear amid the ongoing immigration raids.

Los Angeles area students are returning to class under a cloud of apprehension after a summer of immigration raids and amid worries that schools could become targets in the Trump administration’s aggressive crackdown.

SEIU 721 and other labor groups rallied in MacArthur Park and elsewhere in Los Angeles throughout the day on Tuesday.