14-year-old arrested in deadly school shooting at a Georgia high school 

Four people were killed and nine others were wounded after a 14-year-old student opened fire Wednesday at Apalachee High School in northern Georgia, authorities said. More than a year ago, tips about online posts threatening a school shooting led Georgia police to interview a 13-year-old boy, but investigators didn't have enough evidence for an arrest. Karl Schmae, retired FBI supervisor, joins D2 to share his insight.