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PITTSBURGH (KDKA) — The Pittsburgh Public School District is asking parents to take some extra time to check their children’s backpacks after a student was found with a knife on a school bus.

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According to the principal at Colfax K-8 School, several classmates say they saw the student with a pocketknife on the bus.

The school is in the Squirrel Hill section of the city.

In a letter to parents, principal Dr. Tamara Sanders-Woods says the district police and child’s parent have been informed of the incident.

She says the incident is being handled “according to School District procedures.”

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The letter reads in part: “At Pittsburgh Colfax, we take incidents like this very seriously and are committed to sharing these types of incidents with you as the safety of our students and staff is always a top priority. Occurrences such as this shed light on the critical importance of having an open dialogue with children regarding all weapons. Please take a moment to talk with your children about the need to inform an adult anytime they hear or witness a questionable situation, whether they are at home or in school. Please let them know that they play a vital role in keeping our school safe.”

Dr. Sanders-Woods also asks parents to be vigilant, talk to their kids and check their child’s backpack each day as a safety precaution.

Any parent with questions is urged to reach out to the principal.

“The guidance and direction you provide as a parent or guardian is absolutely critical as we work together to keep our school a safe and welcoming environment for all,” the letter continued.

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Stay with KDKA for the latest on this developing story.