Mass shooting plot at SoCal high school thwarted by alert security guard

WHITTIER, Calif. -- Authorities say they've thwarted a student's plot for a mass shooting at a Southern California high school.The Los Angeles County Sheriff's Department said Tuesday that a security guard at El Camino High School in Whittier overhead a "disgruntled student" threaten to open fire on the school on Friday, just two days after 17 people were gunned down at a Florida high school.Sheriff's spokeswoman Nicole Nishida tells The Associated Press deputies discovered "multiple guns and am