The drastic decision yesterday to close more than 900 schools and to keep 640,000 students at home was made out of "an abundance of caution," and in light of the deadly December 2 attacks in nearby San Bernardino, said schools superintendent Ramon Cortines.
"I'm not going to take the chance with the life of a student," said Cortines, who runs the Los Angeles Unified School District (LAUSD).
But Los Angeles Mayor Eric Garcetti told reporters later yesterday: "We can now announce the FBI has determined this was not a credible threat."
A similar threat was also made against New York schools, but officials there said they deemed it not credible from the onset and accused Los Angeles school officials of badly overreacting.
California congressman Adam Schiff said the emails, sent late on Monday from an IP address in Frankfurt, Germany, were likely a prank.
"Preliminary assessment is it was a hoax to disrupt school districts in large cities," Schiff said on Twitter.
But Garcetti cautioned it was too early to draw conclusions.
Authorities raised the alarm after several members of the LA school board reported receiving emails threatening violence involving backpacks and packages left at some schools.
California congressman Brad Sherman told CNN that the emails had come from a person claiming to be a "extremist Muslim" who said attacks would take place on Tuesday and would involve nerve gas.
The message also said the person boasted of having "32 accomplices... All ready to take action today," Sherman said.
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