Photo by John Schreiber.
Photo by John Schreiber.

Mira Costa High School in Manhattan Beach was closed for an hour Monday because of a posting on the social media site Yik Yak, authorities said.

“If you go to Costa you should watch out very closely at school today,” the post read.

Classes were suspended about 11:30 a.m. while police and school officials investigated.

The campus was reopened an hour later.

— City News Service

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