Published: Aug 19, 2013 1:42 PM EDT

CAPE CORAL, Fla.- The Cape Coral Police arrested a 13-year-old Cape Coral Charter School student Friday afternoon, who allegedly brought a knife with a 7-inch blade to school, and threatened another student with it on the school bus.

A concerned parent contacted the assistant principal regarding the incident that allegedly happened Wednesday morning. The parent said the 13-year-old borrowed the victim's cell phone Tuesday and would not return it. The suspect was reportedly on the phone with an 18-year-old who lived out-of-state. Upon receiving the phone back, the victim told the person on the phone that the suspect was only 13 years of age.

The following day, the 13-year-old allegedly confronted the victim with the knife, demanding the victim speak to the person on the phone again, and say he/she had lied about the suspect's age.

When police contact the suspect, she told them she was upset with the victim, so she brought a knife to school in her shoe. According to her arrest report, she told them she displayed the knife when she asked the victim to contact the man who had been on the phone the day before, and tell him that she wasn't in middle school.

The teen was then arrested and taken to the Juvenile Assessment Center.