FORT PIERCE, Fla. (AP) — Police have arrested a Florida teen who they say posted a Facebook message threatening to "bring a gun to school tomorrow and shoot everyone."

The St. Lucie County Sheriff's office said Thursday night that they received a tip from a parent who saw the threat from the 13-year-old student.

Neither the teen nor his school has been identified.

A sheriff's spokesman says the student did not have access to any weapons. No schools were evacuated or locked down, but security at area schools had already been increased as a result of the mass shooting at a Connecticut school last Friday. The student is charged with a single second-degree felony charge of making a written threat.

Authorities say he is being held at the Juvenile Detention Center in Fort Pierce.