Los Angeles shuts public schools after threatening email

Los Angeles shut down the United States' second-largest public school system on Tuesday after officials received a threatening email mentioning backpacks and packages, two weeks after a married couple inspired by Islamic State killed 14 people in San Bernardino just 60 miles (100 km) away. The unprecedented move left some 643,000 students of the Los Angeles Unified School District and their families scrambling to make alternate arrangements and drew criticism as officials in New York said they r