GUILDERLAND — On Monday, a medical emergency at Guilderland High School led the administration to follow its standard procedure of calling for a “shelter in place” so hallways were clear for first responders, according to an email sent to “GHS Families” on Monday afternoon.

“The wrong code was entered into the security system, inadvertently triggering a lockdown alert,” the district email said. “This was immediately rectified; the Guilderland Police Department and GHS students and staff were notified at once. There was never a situation that required GHS to be in lockdown.”