UPDATED | December 15, 2015 10:11 AM

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LOS ANGELES (CBSNEWS.COM) – An “electronic threat” against several Los Angeles Unified School District schools has prompted the closure of all of the district’s campuses Tuesday.

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Superintendent Ramon Cortines said the threat was “conveyed not to one school, but many schools in the district. Details talked about backpacks, other packages.”

An FBI official told CBS News senior investigative producer Pat Milton that the FBI is assisting the Los Angeles Police Department in the investigation.

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Los Angeles Unified School District police Chief Steven Zipperman says the threat is still being evaluated.

On December 2 of this year, two North Texas school campuses increased security after threats were made to those institutions. One threat was written on a bathroom wall and the other on social media.

The threat in Los Angeles was called in to a board member, according to the Los Angeles Times.

An email sent to North Hollywood High School parents called it a bomb threat and said students and staff should remain at home until the situation is resolved, CBS Los Angeles reported.

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