Authorities say there was a bomb threat at Parkland's Marjory Stoneman Douglas High School Monday.
The Broward Sheriff's Office bomb squad responded and conducted a search but found no threat.
Additional deputies were placed on campus as a precaution and the incident remains under investigation.
Security has been bolstered at the school with additional sheriff's deputies being placed on campus since the school reopened; two weeks after a mass shooting on Feb. 14.
Eight Florida Highway Patrol troopers were added after a student brought a knife to school, another made online threats and the brother of suspected shooter Nikolas Cruz was found skateboarding on campus.