Detectives from the Broward Sheriff’s Office Threat Management Unit and Real Time Crime Center tracked down the girl, who they said admitted to making the false threats.
She faces two counts of written threat to kill and false reporting concerning a firearm.
The middle school student’s arrest is part of an alarming number made over the past week in which Broward County Public Schools students have found themselves under threat of violence from other pupils.
On Monday, police arrested a 16-year-old boy for sending texts and emails threatening a shooting to school employees at Cypress Bay High School in Weston, authorities said.
The school was placed on a code-red alert on Friday after the messages were sent, and detectives searched the premises in an attempt to find the sender, according to law enforcement.
Faculty and students continued to receive threats until Monday that prompted a code-yellow status.
The high school junior, who was a student at the school, was sent to the Juvenile Assessment Center and faces two counts of making a false report concerning the use of a firearm and two counts of writing threats to kill.
Last Thursday, Broward County officers arrested a 14-year-old high school student accused of making bomb threat phone calls to an elementary school and a middle school that morning.
Both schools had to be evacuated as deputies searched for the threats, which were later found to be false.
The teen admitted to making the false alarms to authorities once she was identified as the caller, they said. She was arrested and taken to the same juvenile intake center before being released to her parents.
She faces two counts of false reporting of a bomb threat.
The motives for all three incidents are being investigated, said Broward Sheriff’s Office public information officer Robyn Hankerson.
Broward County Public Schools didn’t immediately return a request for comment.
Florida lawmakers have made school threats a second-degree felony in the aftermath of the 2018 shooting at Marjory Stoneman Douglas High School in Parkland, Fla., that killed 17 people, the Associated Press reported. Parkland also is in Broward County.