School lockdown drills have become common — experts say they could be better
Before the Columbine High School shooting, schools prepared for fires and natural disasters. After the 1999 massacre, states enacted lockdown and active shooter drills.
Watch CBS News
Before the Columbine High School shooting, schools prepared for fires and natural disasters. After the 1999 massacre, states enacted lockdown and active shooter drills.
After completing a sweep of Los Angeles High School's campus, police have determined there is no clear threat to students and staff members.
Police placed Los Angeles Academy Middle School on lockdown Tuesday afternoon after receiving "threats of violence" via a 911 call. After a thorough investigation, they were unable to locate a suspect or any victims and the lockdown was lifted.
Rena Nakano reports from City of Industry where an elementary school was placed on lockdown Friday as authorities searched for a pair of potentially armed suspects who were said to have fled from a crash off the 60 Freeway.
Measures could include public awareness campaigns, an array of programs at parks and senior centers as well as expanded mental health services.
Criminal charges were filed Thursday against a Chino man who allegedly threatened to shoot up Citrus College in Glendora this week.
Students crossing a street near Hewes Middle School had reported seeing someone in a car who appeared to have a weapon.
Two dozen police officers responded to a massive brawl between students at a Glendale high school Wednesday.
The man was shot after holding 70-year-old teacher Linda Montgomery hostage for nearly 7 hours.
Classes will resume Thursday at De Anza Middle School in Ontario after a 13-year-old boy was arrested for running through the campus wearing a mask from the movie "Scream" and allegedly pointing a gun at a teacher.
Grant High School in Van Nuys was locked down for a second day in a row to allow a bomb squad to search the campus, following an online threat.
A lockdown at two schools in Simi Valley was lifted after a report of a person armed with a long gun, walking onto one of the campuses, turned out to be someone carrying a drill team rifle.
Two schools were briefly put on lockdown Tuesday while police tracked down a man who was allegedly threatening people with a machete in Santa Ana.
Two schools were put on lockdown Friday for about an hour as police searched for possibly armed suspects in Downey.
Moreno Valley police said three students at Mountain View Middle School triggered a gun scare Wednesday when they allegedly brought an air pistol to campus.
Frontier Continuation High School was placed on lockdown Wednesday morning after a boy walked into the campus office suffering from stab wounds to his left arm and shoulder, police said.
Police arrested a suspect Thursday believed to have dumped a loaded gun across from the Canoga Park High School and fled onto the school's campus, triggering a three-hour lockdown.
A 35-year-old man reportedly wanted on multiple charges barricaded himself in a Garden Grove home Thursday afternoon, prompting officials to lock down a nearby elementary school.
Authorities locked down two San Fernando Valley schools Thursday following a fugitive search.
An attempted murder suspect has been taken into custody by police near Chatsworth High School.
An elementary school was locked down Wednesday as deputies searched for a gunman who reportedly fired a shot near the school.