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St. Louis County, MO (KSDK) - A 64-year-old substitute teacher has been charged with unlawful use of a weapon.

Police say Stanley Covington was the substitute teacher for a class of 15 students at Normandy Middle School Wednesday morning when the students began horsing around before class.

Authorities say Covington tried to calm the students down and get them ready for class.

Witnesses told police one student was not moving quickly enough and Covington began arguing with the student.

The students said during the argument Covington pulled out a 5 ΒΌ inch fixed-blade knife and held it six inches from the student's chest.

At 2:30 p.m. Normandy police were called to the school and questioned Covington. He told police he lost control of the class and started to walk out to the hallway to find a security guard when someone threw a calculator at his head.

Covington told police he turned back around and saw that his knife had been dug out of his bag and placed on his desk.

Police say they are concerned about the delay between the time of the incident and when police were called.

Covington is held on a $10,000 bond at the St. Louis County Jail.

The Normandy School District released the following statement to NewsChannel 5:
"On November 7, 2012, the Normandy School District received a report that a substitute teacher was in possession of a knife while on district property. No one was injured as a result of this alleged incident. We hold the safety of our students in highest regard, and have reported the incident to appropriate authorities. The matter in question is being handled by the St. Louis County Police Department and the Children's Division of the Missouri Department of Social Services. The school district is cooperating fully in this investigation. The District must treat all matters involving personnel as confidential. Therefore, the District has no further comment at this time. Please be assured that protecting the welfare of all students and providing a safe and secure learning environment is our school district's first priority."

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