The district says the move was "out of an abundance of caution," and the Vineland Police Department is investigating.
District officials issued a statement about the closure on Wednesday night.
"Out of an abundance of caution, all Vineland Public School buildings will be closed (today), Thursday, September 30. All staff and students will remain home unless otherwise directed. We will share more information when it becomes available. This also includes all district preschools. No remote/virtual classes will be held," the statement read.
On Thursday, the district said they followed recommendations from the police department to ensure a safe and secure environment for all students, staff, and visitors and take all threats seriously.
A decision about school on Friday has not yet been made, officials said. An update for families and staff will be provided soon.
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