Washburn High School in Minneapolis is closed on Friday as a precaution after officials received a threat.
The threat was made late on Thursday, and because of the time it was received the school said it couldn't carry out "a thorough investigation using our normal protocols" in time to open on Friday.
"In order to ensure the safety of students and staff, we are taking the unusual step of canceling classes at Washburn today, Friday, June 1," the school announced.
"This will allow us to continue partnering with the Minneapolis Police Department to thoroughly investigate the situation."
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It's the latest in a long line of threats made against schools in Minnesota since mid-February, when 17 were killed in a school shooting in Parkland, Florida.
The threats tend to cause schools to go into temporary lockdowns, however it's rare for a school to close for the day as a result.
Washburn High School is in the Tangle Town neighborhood of south Minneapolis.