Lynbrook High School students will not be allowed to bring backpacks or dark-colored bags to school Friday following a possible warning made against the school, officials said.
"We have discovered information regarding a possible, non-specific warning at the high school for Friday," said Superintendent Melissa Burak in a letter to parents.
Officials said they have a "strong indication" that some high school students knew who made the warning.
The contents of the warning have not been revealed.
Lynbrook Police Department officials said the school was taking a "very proactive" approach to ensure the safety of every student. Several police officers will likely be present during the day Friday, especially in the morning as students are coming into school.
As a part of an emergency safety plan, all staff members have been placed on a "heightened alert," according to Burak, and the campus is undergoing a thorough search.
Students will not be permitted to bring backpacks or dark-colored bags into the building. Instead, they must carry them by hand or in a clear plastic bag, officials said.
Lynbrook PD officials said if a student violates the policy, they will likely be searched.
"This is a perfect opportunity for you to speak with your child about the importance of speaking up if they know anything about this situation or any other situation that might arise down the road," wrote Burak.