Police officers respond to a call that an active shooter had reportedly injured 24 students at Chillicothe High School in Chillicothe, Ohio, in September. The call turned out to be a hoax. Similar scenes have played out at schools across the country in recent weeks.
Chillicothe Police Department/Screenshot by NPR
LA County Sheriff's patrol cars leave El Camino High School in Whittier, Calif., on Wednesday. A 17-year-old student threatened to open fire at the school days after the massacre at a Florida school. An alert security guard who overheard him reported it to police, who went to the boy's home and found two AR-15 rifles, authorities said Wednesday.