How should parents respond to potential threats in schools?

Two 15-year-old girls have been arrested for allegedly plotting a school shooting at Corona High School in Riverside County, California. The FBI alerted local police to potential threats based on their social media communications, leading to the girls' arrests on suspicion of conspiracy to commit murder. The investigation revealed they had spent months researching school shootings and discussed methods to obtain weapons, although no weapons were found. Authorities emphasized the importance of reporting any suspicious activity to ensure safety.