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The Latest: Students returning to Los Angeles schools a day after threat shut down district

Police officers walk out of Los Angeles High School in Los Angeles, on Tuesday morning, Dec. 15, 2015.  All schools in the vast Los Angeles Unified School District, the nation's second largest, have been ordered closed due to an electronic threat Tuesday.(AP Photo/Richard Vogel)

Police officers walk out of Los Angeles High School in Los Angeles, on Tuesday morning, Dec. 15, 2015. All schools in the vast Los Angeles Unified School District, the nation's second largest, have been ordered closed due to an electronic threat Tuesday.(AP Photo/Richard Vogel)  (The Associated Press)

The latest on schools in the Los Angeles Unified School District reopening after a threat (all times local):

8:20 a.m.

Students are heading back to class a day after an emailed threat triggered a shutdown of the vast Los Angeles Unified School District.

School buses are rolling Wednesday morning and parents are dropping off children at campuses in the nation's second-largest school district.

The decision Tuesday to close the district with 640,000 students came after a school board member received an email threatening a large-scale attack.

District Superintendent Ramon Cortines says he ordered the closure as a precaution.

New York City schools received a similar threat but officials there concluded that it was a hoax.