Police in Mount Vernon were dispatched to Casey Junior High Friday for a report of an armed student making threats. Police received the report around 12:30.p.m. of an armed student on the east side of the school. Police responded to the report a found two juveniles and came into contact with two juveniles at the intersection of 18th and Casey. One student was said to be a student. The young man was said to be armed. Police arrested one of the juveniles. No injuries were reported.