Authorities are still investigating a threatening note found Thursday in a Quincy Junior High School restroom.
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The district put out notification to news outlets about 3:45 p.m. Friday and altered parents later in the evening.
The Quincy Police Department and school officials continue to investigate the note discovered shortly after 10 a.m. Thursday by a student.
No arrests have been made, assistant principal Richard Owsley said Monday.
The school remains under a heightened state of alert and students had their bookbags checked Monday as they returned to school from the weekend.
The district is offering a cash reward for any information that leads to a conviction of the person responsible for the threat. Anyone with information about the case can remain anonymous.