The incident started at 3 p.m. when many students have already been dismissed.
San Clemente High School was locked down for roughly four hours Thursday after an apparent threat was found on YikYak, an anonymous downloadable smartphone application.
Students were being kept inside classrooms at Toland Way Elementary after a burglary took place across the street from the school, according to police.
A student whose threatening note prompted a lockdown at Moorpark High School has apparently killed himself by stepping in front of a train.
Authorities say police activity just outside an elementary school in Azusa resulted in the school being placed on lockdown on Friday afternoon.
Authorities say a 14-year-old boy has been detained after allegedly pointing a replica handgun at another student on a school campus in Thermal.
Authorities have filed a terrorizing charge against a Southland student who allegedly made threats that led to the brief lockdown of a college campus in North Dakota.
Three South Los Angeles elementary schools were placed on lockdown Tuesday morning following an armed robbery and shooting in the area.
Officials Tuesday were responding to a report of a “takeover-style” bank robbery in Long Beach.
A Temple City elementary school was on lockdown Wednesday due to a threat of two bombs on campus.
A Fontana elementary school Monday was on lockdown as deputies were investigating a report of a possible man with a gun on campus.
Authorities Friday said they’ve taken one person into custody following a report of a man with a gun in Paramount.
The FBI joined Arcadia police Friday in their search for the suspect behind threatening calls that led to the lockdown of a local school as well as several public facilities over the past week.
Arcadia High School Thursday was on lockdown after police received an anonymous call stating there was man with a gun on campus.
Duarte High School and Northview Intermediate School were placed on lockdown Tuesday afternoon, officials said.