Los Angeles Unified School District closed all of its more than 900 schools this morning after receiving a "credible threat" of violence.
An electronic message that reportedly claimed backpacks and packages would be used for violence prompted LAUSD Superintendent Ramon Cortines to close the second-largest school district in the country, according to the Los Angeles Times.
"I think it's important to take this precaution based on what has happened recently and what has happened in the past," Cortines said at a press conference this morning.
The superintendent was most likely referring to the San Bernardino shootings that killed 14 people earlier this month in the second deadliest terrorist attack since Sept. 11, 2001, as well as the 2012 mass murder at Sandy Hook Elementary School in Newtown, Conn., that killed 26 children and adults.
Officials plan to search all of the district's schools before schools reopen on Wednesday, the news site reports.
While parents have been notified, some students arrived at school before parents could pick them up. Those students will be supervised until parents arrive.
"Parents/Guardians, please bring proper ID when picking up your child at school," read a statement from LAUSD. "They will be required."