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.

“Hungry children, children in fear, cannot learn well,” Carvalho said in a news conference.

He also announced a number of measures intended to protect students and families, including adding or altering bus routes to accommodate more students. The d

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