The Washington Post reports that all Los Angeles public schools have been closed for the day after a "'credible threat' of violence to students at numerous schools in the sprawling district, and a schools official confirmed that it was a bomb threat to the school district." According to the Houston Chronicle, a law enforcement official speaking anonymously with the Associated Press said that the threat "was emailed to a school board member and appeared to come from overseas. The official spoke on condition of anonymity because he was not authorized to speak publicly about the investigation. The official says the threat was sent late Monday. Superintendent Ramon Cortines says the threat was made against students at many of the district's schools." The Los Angeles Unified School District, the second-largest school system in the U.S., is no picnic to close; the New York Times notes that the closure throws into disarray "the lives of millions of Angelenos — students, parents, teachers and other school staff members."