Public schools in Los Angeles are to reopen on Wednesday after a terror threat authorities now believe to be a hoax.
More than 1,000 schools were closed after an email was sent to a school board member.
Hundreds of thousands of schoolchildren were sent home after a threatened attack "with bombs and assault rifles".
The email was routed through Germany but it is thought it originated locally.
It comes after 14 people were killed and 22 others wounded in the San Bernardino shooting two weeks ago.
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