Seventeen schools in Nashua, New Hampshire, shut down Monday after administrators received an email threat to harm students.
The threat was made specifically against the two high schools in Nashua, but officials shuttered all 17 schools in the district out of caution.
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"[The threat] had specific directions toward the two Nashua high schools with specific threats of violence, which is why we are taking it kind of seriously," said Lt. Kerry Baxter, WMUR reported.
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Police haven't released details about the threat.
But Supt. Mark Conrad said the threat bluntly stated "that there would be an action taken to hurt students" on Monday, the local channel reported.
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Conrad continued: "They haven't been able to determine at this time whether or not the threat is credible, and since they can't rule out that it is a credible threat, we decided to take the cautious course of action and close all our schools."
Conrad acknowledged "these [threats] seem to be going around the country ... [and] happening more frequently."
The Nashua Police Department is investigating. School officials said they expect classes to resume Tuesday, but a state police bomb squad was called to Nashua High School North to investigate.
"As a parent," said Barbara Lao, in the local WMUR, "it scares me because I don't want to send my kids to school and not have them come back home to me. Whether we should send our kids to school, that is the question."