All schools in the vast Los Angeles Unified School District have been ordered closed due to a threat.
Los Angeles Unified School District police Chief Steven Zipperman says an "electronic" threat led to the decision to close all schools in the nation's second largest school district Tuesday morning.
Zipperman says the threat is still being evaluated.
A law enforcement official says the threat was emailed to a school board member late Monday and appeared to come from overseas.
District Superintendent Ramon Cortines says the threat was against students, not just a single campus.
Officials are notifying parents to keep their children at home.
LAUSD schools are closed today due to credible threat. Updates will be provided via https://t.co/AZDfmuaMmu & 213-241-2064.
— LAUSD (@LASchools) December 15, 2015
The district, the second largest in the nation, has 640,000 students in kindergarten through 12th grade and more than 900 schools and 187 public charter schools.
The district spans 720 square miles including Los Angeles and all or part of more than 30 smaller cities and some unincorporated areas.
"Students that have arrived at school will be with staff until parents or guardians can be contacted," district officials said. "Parents/Guardians please bring proper ID when picking up your child at school. They will be required."
Superintendent Ramon Cortines said the schools commonly get threats but called this one rare. Officials wouldn't elaborate.
Cortines says he ordered the shutdown out of an abundance of caution after the Dec. 2 attack in nearby San Bernardino that left 14 people dead.
The superintendent said every school is being searched by appropriate personnel.
New York City officials say they received same threat that closed L.A. schools, but concluded it was a hoax.