LOS ANGELES — Los Angeles students and teachers return to class for the new academic year Thursday under a cloud of apprehension after a summer filled with immigration raids and amid worries that schools could become a target in the Trump administration’s aggressive crackdown. Los Angeles Unified School District Superintendent Alberto Carvalho has urged immigration authorities not to conduct enforcement activity within a two-block radius around schools starting an hour before the school day begins and until one hour after it classes let out.

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