Yet district Superintendent Ramon Cortines repeatedly defended the decision, citing the San Bernardino attack.
"It’s due to circumstances in neighboring San Bernardino … I as superintendent am not going to take the chance with the life of a student," Cortines said. He called the email a "rare threat."
Beck said Los Angeles officials “began to work jointly to vet that threat” after they received it on Monday. He added it was “irresponsible” to criticize the school closures at that point.