A school in Huntington Station was evacuated after a threatening message was found written on a radiator.
School district officials say a teacher at the Maplewood Intermediary School found the message just after 1 p.m. Tuesday.
The school is for students in grades 3 to 5.
Students were evacuated and bused to Walt Whitman High School, where parents were told to pick them up.
Suffolk police are now investigating who left the message.