■ Since the Columbine shootings in 1999, shooter drills have become the norm at U.S. schools.

‘The safety is primary,’ official says of actions

It’s a familiar scenario: A school official, hearing about a potential danger that’s too close for comfort, locks down the building. A nearby bank may have been robbed. Officers might be serving a warrant in the neighborhood. There are reports of shots fired in the area.

For a Northern California elementary school, the quick action is credited with thwarting greater disaster Tuesday when a gunman on a deadly rampage was kept from walking through the school’s doors.

Schools have become adept at rapidly shoring up security, measuring responses against the toll it could take on students’ learning and sense of safety.

On the same day as the California rampage, across the country in upstate New York, a heavily armed gunman fired shots while pacing the parking lot of a dollar store. As police rushed to the scene, two nearby schools issued a “lockout,” with students and teachers going about their regular day while under instructions not to let anyone in the building.

“You want to take appropriate measures but you also don’t want to alarm people unnecessarily, too,” said Matthew Bystrak, acting superintendent of the West Seneca School District outside Buffalo, where the lockouts were issued.

Since the 1999 Columbine High School shooting, active shooter and lockdown drills have become as common as fire drills, with students and staff practicing throughout the year, said Don Bridges, president of the National Association of School Resource Officers.

“Any time schools start to hear about something going on that could possibly pose a threat to their school, there’s got to be some sort of action that the school takes. Even if they don’t go into a full lockdown, there’s a hyper level of awareness,” said Bridges, a school resource officer in Baltimore County, Maryland.

It could mean locking the doors or halting class changes to let paramedics reach an injured student, or a full-blown lockdown in which exterior and interior doors are locked and perhaps barricaded, blinds are drawn, lights turned off and students and teachers crouched out of view.

Two days later in another Buffalo suburb, Alden, a device with a battery and wires was found in the locker of a student who had talked about making bombs. The district issued a lockdown until sheriff ’s deputies with K-9s determined there was no threat.

“The disruption is secondary. The safety is primary,” Superintendent Adam Stoltman said Friday.

Rich Pedroncelli The Associated Press Randy Morehouse, the maintenance and operations supervisor for the Corning Elementary School District, walks Wednesday past the gate at the Rancho Tehama Elementary School that gunman Kevin Janson Neal crashed through during his shooting rampage.