MINNEAPOLIS (WCCO) – Officials at Washburn High School in Minneapolis say classes will go on as usual Thursday after a threat was made and police determined it was not credible.

The school sent out a letter to parents saying that a threat was made against the school intended for Thursday. Officials said they notified city police immediately after receiving it, and officers did a walk-through of the school Wednesday night.

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Police found no unsafe materials, and it was determined that the threat against the school was not credible.

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As such, classes will go on as scheduled, but the school will be in a code yellow lockdown. That means students must be in classrooms during class periods, the school’s outer doors will be locked, and visitors must display identification in order to enter the building.

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On Wednesday, Southwest High School closed after receiving a credible threat. It was open for classes again on Thursday.