PORT ST. LUCIE, Fla. (CBS12) – Police arrested an 11-year-old Fort Pierce boy on Friday following allegations that he made a cyberthreat to kill a girl classmate. The Port St. Lucie Police Department (PSLPD) confirmed with CBS12 News that around 4 p.m. Friday, police responded to the corner of SW Babylon Street and Gadsan Ave. for reports that a Port St. Lucie girl had received messages saying the boy would kill her along with pictures of a firearm.