Connecticut officials released a 44-page report Monday that outlines how 20-year-old Adam Lanza killed 20 young students and six staff members at Sandy Hook Elementary School last December.
Investigators say Lanza was obsessed with mass murders and even collected newspaper clippings about school shootings.
How did that not raise a red flag?
Criminologist Casey Jordan is OutFront.
Shots rang out at the Lone Star Community College in Houston today in what officials are now blaming on a fight between two people.
Police and emergency responders swarmed the campus minutes after the 9-1-1 call as students ducked under desks and ran for cover.
At least three individuals were injured, including a maintenance worker who was caught in the crossfire. Two suspects are in custody.
CNN's Ed Lavandera is in Houston with the latest.