A suspicious call led to a "secure code" at Marjory Stoneman Douglas High School in Parkland Wednesday afternoon.
In a message sent to parents, Broward County Public Schools officials said the suspicious call was received by the Broward Sheriff's Office.
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There was an increased police presence at the school before law enforcement gave an all-clear and students were dismissed.
Dismissal was delayed for about two hours. Some students said they remained inside their classrooms, and teachers locked their doors as police investigated the school.
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The incident comes a day after the community remembered the 17 people killed in the Feb. 14, 2018, shooting at the school.
“The anniversary does not help so I hope they trace the call whoever made, whatever threat," parent Enrique Garcia said.