Lights flashed, alarms buzzed and an announcement blared through an electronic classroom display: “At this time we will be moving into a lockdown,” the voice warned.

The alert was part of a recent demonstration of a new security system installed at Plainedge High School in North Massapequa, where every district classroom now has sleek wall-mounted devices that will eventually livestream video and audio feeds to police during an emergency such as a mass shooting. The panels, officials said, will allow first responders to see directly into classrooms to determine the exact location of a shooter or any injured victims.

School officials across Long Island have grappled for years with how best to protect students and staffers in the event of an attack. Concern over school safety was reignite

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