Students returned to class after a bomb threat forced evacuations at Martinez Middle School in Lutz Thursday morning.
Hillsborough County Public Schools say the campus was searched and the threat was unfounded.
Students and staff were in the gym at Steinbrenner High School next door.
Steinbrenner High School and McKitrick Elementary are nearby and were both on lock-in procedure.
This story is developing and will be updated as more information becomes available.