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, 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. For more on Plainedge schools new security measures, visit the link in bio. #longisland #longislandny #liny #longislandnewyork #nassaucountyny #nassaucounty #plainedge #plainedgeny #plainedgeschools #plainedgehighschool #plainedgereddevils #northmassapequa #school #schoolsecurity #securitysystem #camera #alert #safety