A 12-year-old student at Kings Canyon Middle School was arrested Friday on suspicion of phoning in bomb threats to the school, Fresno police said.
School district officials say they received a bomb threat about noon Wednesday and a second threat about noon Thursday.
The call was made from a cell phone by a student who said there was a bomb on the campus.
A short time later, another 911 cell phone call was made from the same number and left "open," tying up the 911 line for nearly 18 minutes, police said.
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Police and school staff searched the middle school and didn't find any suspicious devices.