false bomb threat

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 Members of the Marblehead police and fire departments were called to Marblehead High School Tuesday after school officials noticed a pair of bomb threats on the social media app Yik Yak.

According to a Marblehead Public Schools announcement, at 10:55 a.m., the high school was evacuated after officials received a bomb threat through the social media site.

At 12:15 p.m., the building was declared safe and students returned to their classes.
http://marblehead.patch.com/groups/police-and-fire/p/yik-yak-bomb-threats-cause-a-stir-at-marblehead-high-school