District spokeswoman Kari Basson said students were kept in their second period classes for about 45 extra minutes.
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She said Kettering police investigated and found the threat not to be credible.
Basson said at 10:40 a.m. that students were about to be released from those classrooms to move on with the rest of their school day.
Police and school officials have not yet been able to identify who wrote the threat, but school resource officers continue to work on it, Basson said.
“We take these types of situations very seriously, even when the threat proves to be non-credible,” she said.
Close to 200 middle school students were in the high school at the time, attending advanced classes.
Basson said a “one-call” message was being sent to all parents of high school and those middle school students who were at the high school, explaining the situation.
We’ll update this story as we learn more.
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