Los Angeles schools were closed on Tuesday after the district received an electronic threat to many schools, school and police officials said.
Los Angeles police and the FBI were notified of the threat, which is being investigated, officials said.
The electronic threat came via a message, Ramon Cortines, the superintendent of Los Angeles schools, said.
"In an abundance of caution as superintendent, Cortines has indicated we have decided to close our schools today until we can be actually certain that our schools are deemed safe," Los Angeles School Police Chief Steven Zipperman said.
"We need the cooperation of the whole of Los Angeles today," the school board president said.
A statement will be issued later Tuesday, Cortines said.
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